How Light Works: The Ultimate Guide

When you’re starting to choose lighting for your home, it can be tough to know where to begin, even if you’re certain of the style you’re looking to create in your home. With so many different lighting options available, and lots of variables between the different types of bulbs, it can be pretty mind blowing. Through this post, we’ll take you through the different categories of lighting that you need in a room, and the types of fixtures that you can use for each category. From there, we’ll cover the important issue of light bulbs, since they’re pretty complex, and understanding how they work makes buying them much simpler.

We’ve written this post with absolute beginners to lighting in mind – those who are setting out living on their own for the first time, new home owners, and those who have previously ‘made do’ but are now ready to create a stylish home that they can be proud of.

 

How light works a beginners guide light bulb sketch

 

What different types of lighting are there?

Where once we would have relied solely on the ceiling light to provide all the light in a room, today designers and lighting experts recommend having a range of different lighting available in a room – with at least one from each lighting category, to allow for optimal amounts of light for all the types of activities that may take place in the room. The main categories are ambient lighting, task lighting, and accent lighting.

As an example, in a bedroom:

  • Ambient lighting allows for getting dressed and moving around
  • Task lighting would allow for reading or for applying makeup
  • Accent lighting may be used to illuminate wall accessories, behind a TV or an aspect of the room’s design

 

Ambient lighting

Ambient light completely fills the room with light, and allows you to use the room as if it is daytime. It is often provided by the ceiling light in the centre of the room, but there are other types of lighting that can contribute to ambient indoor lighting.

It may be the case that producing the optimal amount of lighting requires a number of lights to be used at the same time.

 

Task lighting

Task lighting does exactly what it sounds like – it produces light for specific purposes. This could be for reading, cooking or for studying. Task lighting can be provided by a range of lights, including:

The type of task lighting that may be required is likely to differ from room to room and between the type of activity that it is needed for. For example, a desk lamp that is only used with a PC, or under-counter lights in the kitchen may be able to be a fixed type, whereas for craft activities, a lamp with a moveable head may be desirable.

 

Accent lighting

Accent lighting can take many forms, but is primarily there to highlight an accessory such as artwork or an architectural feature. This can be provided by lots of different types of lights:

Since accent lighting is there to highlight, then simpler light fixtures can help to keep the focus on the feature.

 

scene accent highlight lighting example in an art gallery

 

What type of lighting fixtures should I use?

The decision about which lighting fixtures you prefer is a personal one, and should be based on the type of look you are aiming to achieve in the room – but having at least one (if not more) of each type of lighting means that you’ll have the flexibility, and will be able to create the brightness that you need at any given time.

 

Ceiling lighting

Ceiling lighting is often the first lights that get chosen when moving into a new home. They tend to provide the general illumination in a room, but also add to the styling of the room.

While your personal preference, and the style and visual weight will ultimately guide your choice of ceiling lighting fixture, there are approximate calculations that you can use to narrow down the type of fixture that will work best in the space.

Working with the dimensions of your room in feet (rather than centimetres), add the number of feet in the width to the number in the length. The answer will give you the number of inches that your light fitting diameter should be. For example, if your room is 6 foot by 10 foot, the optimal size of light fitting would be 16 inches – which is about 40cm.

If you’re choosing statement lighting such as pendants that hang from the ceiling, the first thing to do is to get your tape measure out. It should go without saying, but you will need sufficient clearance underneath the fixture to avoid breakage and potential injuries. When hanging feature lighting from the ceiling, it is essential to have a minimum of two metres clearance between the floor and the bottom of the fixture (and if some members of the household are particularly tall, maybe a little more). If you’re hanging pendant lighting above dining tables, there should be at least 65cm between the table and the lighting fixture.

 

Wall lights

Wall lights can be used for all kinds of purposes – either to add to ambient lighting, as task lighting or as accent lighting – as well as providing a decorative accessory in a room with simpler styling. The function of the wall lights will influence the type of fixtures that you choose, while the style of the room will influence the type of wall lights that are chosen.

Where wall lights are used for effect, there may be a number of wall lights used – either paired, or in a series – or they may be positioned in an unusual spot. Using wall lights with colourful shades, and matching them with ceiling lighting can help to tie the overall look and feel of the room together, particularly where other accessories in the room coordinate.

 

Lamps

Whether you are choosing floor lamps, table lamps or desk lamps, as with wall lights, you’ll make your decision based on the size of the room, what category of lighting it is providing, and what activity the lamp will be illuminating.

Depending on their size, table lamps may contribute to the ambient light in a room, or may be purely used as task lighting – for example, for reading, or as a portable lamp that can be used for sewing or other types of crafts. Since more of us are using electronic devices for reading today (and are attached to our phones too), many styles of lamp now include USB charging points as part of their design. Where lamps are used for reading, dimmer switches are desirable – since this allows for better lighting throughout the day and night, when different levels of lighting are appropriate.

When choosing a table lamp:

  • Be sure that the bottom of lamp shade is approximately at eye level when seated, so that the bulb doesn’t shine directly in your eyes
  • Situate the lamp close enough to illuminate the task sufficiently
  • If the room has people walking through it often, then ensure your lamp is stable, so to prevent it tipping over
  • Ensure that the relative proportion of the lamp is appropriate – it should be no more than one and a half times the height of the item furniture that it sits on

When choosing a floor lamp:

  • As with table lamps, ensure that the lower edge of the shade is at eye level when seated
  • Avoid obstructing the view of décor such as artwork, as well as between seating locations
  • The smaller the room, the smaller the lamp should be
  • Keep safety first – if the floor lamp is likely to become a trip hazard (especially for children or elderly residents) it isn’t the right one

 

table desk floor lamp lighting

 

What type of light bulb do I need?

Once you’ve established the type of light fittings that you’re going to use in a room, and you’ve decided on the exact ones that you’re going to buy, you’ll need to choose your light bulb. Not all light fittings will have bulbs sent with them, and where they are, the bulb may not be to your preference. Choosing a light bulb isn’t always easy or straightforward either – since there are a number of variables that you’ll need to consider.

 

Choosing the right light bulb

If you’re replacing a bulb in an existing light fixture, the rule is to replace like with like – especially when it comes to the type of fitting. But the fitting isn’t the only thing you’ll need to consider. You’ll need to think about what the light is for (is it for ambient, accent or task lighting?), and what shape suits the fixture, as well as the cost both of the purchase, and in the longer term. Let’s take a look in more detail.

 

Fitting

While there are plenty of different types of light bulb fitting, when we’re looking at domestic light fittings, there are three main types that prevail: bayonet, screw cap, and pin and push-fit base bulbs. Generally, with these types of light fixtures, it should be easy to find a bulb that will suit.

When changing a bulb, you’ll need to find the same type of fitting for the replacement. Although adaptors are available, they should rarely be required, since different types of bulbs are so easily found today, especially from lighting specialists.

But establishing the fitting of the bulb is the easy part, since you don’t have to opt for the same colour or brightness – which is what we’ll come to next.

 

Function

As we’ve already determined, there are many different types of lighting fixtures, that can be used for different purposes. The function that the light fitting fulfils will determine the brightness, and the hue of the bulb that you choose.

 

Brightness

Newer types of bulbs use different amounts of watts to produce the same amount of brightness – and there are differences between types. Historically, light bulb manufacturers used the number of watts that were required to produce the amount of light to illustrate the brightness of a bulb.

Today, bulbs are much more efficient, and to produce the same amount of light as an old style incandescent 60 watt bulb, an LED bulb needs just 10 watts, while a halogen bulb requires around 42 watts. The differences in watts required for the same amount of light is the reason that light bulb manufacturers no longer use the measurement of watts to describe the brightness of a light bulb. So rather than measure the amount of power required, manufacturers now use Lumens to describe the levels of brightness that the bulb will provide. The higher the number, the brighter the light provided by the bulb.

 

Warmth

When choosing your light bulbs, you’ll also need to consider whether you want a cool toned, or a warm toned bulb. The decision will depend on several factors:

  • What type of fixture you’re using the bulb in
  • The space the light is being used in
  • What activities the light will illuminate
  • The time of day the room, and the light will be used

For rooms that require lighting levels that are near daylight, and that aren’t being used close to bedtime, then a cooler toned bulb can be used – bright white, or slightly blue-toned, will help to mimic natural daylight. Where being alert is not as desirable, such as for bedside table lamps, then warmer, yellow toned bulbs are preferable.

The measurement of bulb warmth is measured in Kelvins. The warmth of candle light is measured at approximately 1,500 Kelvin, while normal daylight (depending on whether it is a sunny or cloudy day) is measured at between 5,000 and 7,000 Kelvin. The higher the number on the Kelvin scale, the colder the light provided will appear, and cooler toned bulbs often appear to be brighter than warmer toned bulbs of the same Lumen measurement.

 

kelvin colour temperature scale infographic

 

Choosing the bulb

Although watts are no longer used as a measurement of light bulb brightness, most bulb manufacturers will display both the Lumen measurement, and the equivalent in watts in an older style incandescent bulb, as well as the Kelvin measurement on the packaging. Not only that, but there will also usually be a description in words to describe the type of light – such as ‘warm white’. That means that when you’re in a store picking a light bulb, if you’re used to choosing bulbs based on watts, you’ll be able to see the numbers that you need, and the description will help if you’re not sure.

 

Format

Once you’ve decided on the colour, brightness and you know the fitting that you need, you can narrow down the shape that you want. There are an incredible array of different shaped bulbs, from traditional ‘bulb’ shapes, to candle, golf ball, pear shape, spiral and stick bulbs – and once you’ve established that you have the correct cap fitting (either screw or bayonet, for example) and the correct brightness, it is up to you. In many cases, if the bulb is hidden, the choice of bulb will be simply down to personal preference and it won’t matter. However, if your lighting fixture intentionally exposes the light bulb, then it may be better choose a style with a decorative filament, or that complements the design of the fixture.

 

Cost

While the general rule of buying the best quality you can afford definitely comes into play here – since a better quality bulb is likely to last longer too. The longer-term cost of running a bulb will also be relevant, especially if you are in your ‘forever home’. The initial cost of LED bulbs are higher than other types, but they are much more energy efficient, and can last for up to 25 years. Not only does this provide much more convenience – you won’t need to replace it as often – but the energy savings can add up dramatically. Savings can add up to more than £180 over the product’s lifetime, which makes it well worth the investment.  ­

 

Final thoughts

We’ve covered the basics of lighting in this post, and yet we’ve barely touched on design. Understanding the basics of lighting is important though, and can help to guide your decisions when you’re designing, and shopping for the room of your dreams. Our key takeaways:

  • Ensure you have a range of lighting in each room, with at least one light from each category of ambient, task and accent lighting
  • Be careful to measure before making a purchase – having lighting that is in proportion to the room, and that allows sufficient clearance is essential
  • Choosing the best bulb for the purpose should be done carefully, with the correct brightness and colour taken into consideration

Our range of lighting covers all the types of fixtures mentioned in this post, and we stock an extensive range of bulbs. If you are looking for a particular item, or need technical advice, please get in touch – our team of experts are happy to help.

 

charles author bio

Charles Barnett Managing Director

Charles started Lyco in 1995 with just 4 enthusiastic employees and has grown it considerably over the past 25 years. Charles is also the Managing Director of Lighting Direct and newly acquired Online Lighting. He now has a team of 50 lighting experts working on growing Lyco Group to be the UK leader in lighting for both businesses and homes. Away from the office he is a keen cyclist and is proud to have cycled 1017 miles from Lands End to John O’Groats to raise money for a new residential centre for adults with multiple learning difficulties.

CFL Bulbs – a handy guide

CFL Bulbs

A compact fluorescent lamp (CFL) is a slim fluorescent tube folded or twisted into a small size. This type of bulb first emerged in the 1980s, but never sold in the desired numbers. Since then, the appearance of CFLs and their quality of light have been greatly improved.

Advantages to CFL

LED technology is better in some respects than fluorescent, but both offer major advantages over filament lighting. Here are some CFL benefits:

  • A CFL uses about 70% less energy than an equivalent halogen bulb and is often close to LED technology for efficiency.
  • A CFL emits light in all directions, so it is a natural replacement for incandescent lighting. (Tip: always check the size of a CFL against your light fitting before buying, as the bulbs tend to be a bit larger than originals.)
  • The lifespan of a CFL is usually between 8,000 and 20,000 hours, which is 8 to 20 times longer than most traditional incandescent bulbs.
  • CFLs are still cheaper, on average, than LED bulbs. They needn’t cost much more than halogen when sourced from a specialist seller such as Lyco.
  • CFLs emit a soft light that flatters nearby decor.

The main drawbacks of a CFL are lack of dimmability and the warm-up time needed to reach full power.

CFL examples: lamp types

The various CFLs available include the following:

    • A 2D lamp produces lots of light for slim fittings such as bulkheads. Note that 4-pin CFLs are usually dimmable, which is rare in CFLs (requires dimmable control gear in the fitting).
    • Pin-fitting CFLs are used in dedicated low-energy fittings. Just to confuse you, these bulbs are named differently according to brand. If you’re looking for a specific pinned CFL and have a code, find it quickly with our handy CFL code look-up chart.
    • Spirals and sticks have standard bayonet or screw-fit bases. Their look takes some getting used to, but is often hidden anyway by shades. Decorative  bulbs are designed to be seen and is a popular choice in hospitality settings and homes.
    • GLS bulbs are available in CFL form, and they make a good replacement for incandescent bulbs with their bright, omnidirectional light. Our Low Energy GLS Bulbs last 5 times longer than most original filament bulbs while costing only a little more.
    • CFL candles tend to be slightly larger than other types of candles and don’t have a clear finish (sometimes preferred for decorative fittings). They do emit a soft light with little glare, however, which makes them ideal for eye-level fittings as well as some ceiling lights.
    • Golf balls and globes are both sold in CFL form. A CFL like the Low Energy Globe is usually used in open ceiling lights and emits enough light for a large room.
    • CFL reflectors replace the incandescent reflectors often used in ceiling lights. Like the originals, their reflective interior coating gathers light and creates a spotlighting effect. Unlike the originals, they are energy efficient.

Feel free to browse our full range of energy saving CFL bulbs.

For more advice and guidance take a look at our Lighting Advice section.

andrew-author-bio

Andrew Evangelidis Head of Buying

Andrew is an experienced buying professional who takes an entrepreneurial approach to identify new lighting solutions and ensure Lyco have first-to-market ranges for our customers. Having previously worked for well known brands such as Wickes, Carphone Warehouse and Toys R Us, Andrew has now turned his hand to sourcing commercial lighting and ensure our customers receive top brand quality products at marketing leading prices. He manages a team of commercial and decorative buyers who travel the world finding new products that our customers don’t even know they need yet.

Energy-Saving Light Bulbs – a definition

The light bulb was invented by Thomas Alva Edison in 1879. Back then, the UK population was a significantly less than what it is today, there were no cars on the roads and no planes in the sky. Any overseas holiday was a cruise of sorts.

The world has changed hugely since 1879, and so has the technology that goes into light bulbs. However, traditional incandescent bulbs were only truly usurped as the go-to bulb by energy-saving light bulbs a handful of years ago. This was well overdue, as incandescent bulbs expend over 90 per cent of the energy they suck-up in outputting heat, rather than light.

In an increasingly energy- and environmentally-conscious world, those old bulbs have no real place – and are in the process of being forcefully phased out.

Rules of energy saving

Although there’s no hard and fast rule in terms of the exact savings required by these new light bulbs, compared to the old type, to define them as ‘energy saving’, the two most popular technologies use between 70 per cent and 85 per cent less. And as they last much longer, the savings will be felt in your pocket as well as by the environment.

CFL – the good, the bad & the ugly

The most common type of energy-saving light bulb is the CFL bulb, which stands for compact fluorescent lamp. Oddly enough, the first type of compact fluorescent lighting was developed not that long after the first incandescent bulb – back in 1890 but never made it into bulb form until 1976, some 84 years later.

However, it’s only in the last decade or so that they’ve gained real prominence on the high street. In 2007 when the UK government announced the UK phase-out of incandescent bulbs, the backlash against CFL bulbs said that they produced weak, ugly light that took an age to get up to full power. CFL bulbs were admirable in their aims, but not always so admirable in their performance.

Today, that’s simply not true. Most domestic bulbs are “instant on”, giving near-full power from the moment you flick the switch, and you can pick the colour temperature you’re after. Warm, or with a cool blue-ish tint – whatever you want.

There are many types of CFL bulbs out there. Perhaps the most familiar is the spiral. It’s cheap to buy and as there’s no extra layer beyond the fluorescent tube, its light output efficiency is excellent.

If you’re after something that has a look a little closer to the incandescent bulbs of old, we offer CFL bulbs that emulate both the traditional rounded bulb shape and the more elongated candle type. The latter is particularly strong as a decorative bulb – with a more elegant look than the slightly more efficient spiral shape.

CFL derivatives

There are CFLs that look almost nothing like light bulbs too. 2D bulbs unwind the fluorescent tube of other CFL bulbs to give even better light dispersal. They’re perfect for stair well, wall light or bulk head fittings, where function takes a lead over form.

Most CFL bulbs are designed to fit in exactly the same housings as old incandescent bulbs, but there are also pin-fit bulbs for fittings that incorporate everything but the bulb itself. The benefit of these bulbs is that they’re cheaper to produce – and hence cheaper to buy.

LED bulbs – not perfect but getting there

The other main type of energy saving lightbulb is CFL’s competitive and plucky younger brother – the LED bulb.

LEDs work in a completely different way to fluorescent bulbs, but offer comparable levels of energy efficiency. One of the key benefits of LED lights is that they do not contain Mercury, a poisonous substance found in CFL lights.

LED lights also solve one of the lingering problems of CFLs, whose lifespan drops significantly if they are turned on and off frequently. They also often offer better lifespan in general – LED lamps can last for up to 30,000 hours where some CFLs are only rated at 8,000 hours. However, this remains light years – or at least light days – ahead of incandescent bulbs.

The downsides of LED bulbs include that they’re generally significantly more expensive than the CFL type, and while they come in all sorts of shapes and sizes, they’re not always available in as high-power variants as CFL. For example, you won’t find a 60W-equivalent LED candle bulb… yet.

Halogen – a low energy alternative

There’s a third type of energy saving bulb too. CFL and LED are the kings of energy saving, but we can’t forget humble halogen. We offer energy saving halogen bulbs, which don’t contain harmful mercury and generally cost peanuts compared to CFL of LED bulbs. However, they remain much less energy-efficient.

The savings speak for themselves

Forgetting their life-spans for a minute, the clearest way to work out the energy efficiency of a bulb is to calculate its lumens per watt rating. A lumen is a standard unit of brightness. CFL and LED bulbs work out at around 50-70 lumens per watt.  Halogen bulbs can manage around 20, while old incandescents will struggle to reach 15 lumens per watt.

Over the space of a year, the energy benefits of using CFL and LED lights is obvious – especially as they tend to last 5-10 times as long. Consumer body ‘Which’ has calculated that a single energy-efficient bulb will save you over £30 on your power bill over five years, and their calculation didn’t factor-in rising energy prices or inflation.

As incandescent bulbs continue to be phased out across the world, we’re only likely to see improvements in today’s energy-saving bulb technologies. What we should all be looking forward to is improvements in LED lights that’ll see prices of LED bulbs start to tumble. For now, why not check out our huge selection of energy saving LED bulbs?

Take a look at our full range of energy saving light bulbs.

Alternatively, if you are looking for more inspiration, advice and news take a look at our Lighting Advice section.

Charles Barnett Managing Director

Charles started Lyco in 1995 with just 4 enthusiastic employees and has grown it considerably over the past 25 years. Charles is also the Managing Director of Lighting Direct and newly acquired Online Lighting. He now has a team of 50 lighting experts working on growing Lyco Group to be the UK leader in lighting for both businesses and homes. Away from the office he is a keen cyclist and is proud to have cycled 1017 miles from Lands End to John O’Groats to raise money for a new residential centre for adults with multiple learning difficulties.

Do I go for sticks and spirals or covered shape bulbs

Back when there were only incandescents, choosing a bulb was fairly simple – get the right fitting, shape and wattage and you were pretty much sorted, even if you did occasionally end up with a reflector bulb looking a bit odd in a lampshade.

However, since the advent of energy-saving bulbs, there seem to be any number of permutations, as manufacturers find ever new ways of bending fluorescent tubing into strange shapes. A lot of this is just slight variance between manufacturers though, as there are basically three main types of energy-saving bulb – sticks, spirals and ‘covered’ bulbs.

stick bulb has a number of small, straight fluorescent tubes rising vertically from the base, and tends to be longer and narrower than a traditional bulb. A spiral bulb, meanwhile, has one continuous spiral tube that forms a round balloon shape like a traditional bulb (or a stylised ice cream cone!).

So is there any difference between these two types of bulb? To put it simply, not a huge amount. Spiral bulbs have more density of tubing, so they can give off somewhat more light than stick bulbs. Also, due to their more traditional outline, spirals can be better suited to traditional fittings where space is limited, or where you want to achieve a traditional ‘bulb’ look. Sticks, on the other hand, can make a real statement when used in modernist or minimalist light fittings, and are often better suited to long, narrow fittings, as they’ll provide light further along the length of the reflector or diffuser. In case you think these bulbs are only available as replacements for standard bulbs, however, you can also get them to suit golfball and candle fittings.

All of which brings us to covered bulbs, such as the GLS CFL bulb (GLS stands for ‘general lighting services’, i.e. the traditional bulb shape, while CFL stands for compact fluorescent lamp). This type of bulb looks much more like a traditional incandescent pearl bulb, with a single bulb shape rather than any visible tubes. As with spirals and sticks, these bulbs are also available in candle and golfball styles

A GLS CFL bulb works in exactly the same way as a stick or spiral, however, as underneath the translucent covering is a stick or spiral tube, just like one of those bulbs. Although it may look very tempting to get this type of bulb for tradition’s sake, there are a couple of reasons to choose a stick or spiral instead. Firstly, stick and spiral bulbs don’t have to squeeze into a cover, so have more length of tube, and hence give off more light. Nor do they have a diffusion layer, which again saps some of the brightness. GLS CFL bulbs tend to be somewhat pricier as well.

Basically, if your light fittings make the bulb visible, and you or the person you’re fitting them for is adamant about having traditional-looking bulbs, go for a covered bulb. Otherwise, for maximum light output at minimum cost, it’s worth choosing a spiral or stick.

Looking for more inspiration, news and advice? Try our Lighting Advice section.

Charles Barnett Managing Director

Charles started Lyco in 1995 with just 4 enthusiastic employees and has grown it considerably over the past 25 years. Charles is also the Managing Director of Lighting Direct and newly acquired Online Lighting. He now has a team of 50 lighting experts working on growing Lyco Group to be the UK leader in lighting for both businesses and homes. Away from the office he is a keen cyclist and is proud to have cycled 1017 miles from Lands End to John O’Groats to raise money for a new residential centre for adults with multiple learning difficulties.