Standard GLS
The GLS is the original ‘General Lighting Service’ bulb-shaped light source, which has barely changed in its appearance from the time of its invention in the late 19th Century to today. In its incandescent form the GLS bulb has a tungsten filament at its centre, which glows hot when voltage is applied. In common with all filament bulbs, the colour temperature is also the physical temperature of the filament. EU legislation has largely phased out production of incandescent GLS bulbs in recent years because of their inefficiency as a light source.
Despite the decline of the original GLS incandescent bulb, the classic and familiar shape of the GLS lamp is still in mass production using the three main alternative technologies:
- Energy-saving halogen is the cheapest replacement for a regular incandescent bulb, and is the more reliable technology for accurate colour rendition. Because it radiates a continuous spectrum, halogen scores a CRI 100 rating by default for colour rendering, despite being a naturally warm source of light (typical 3000K colour temperature).
- Fluorescent GLS bulbs offer substantial energy savings and significantly increased lifespan over incandescent or halogen GLS lamps at a lower cost than LED.
- LED GLS bulbs are the ultimate energy-saving choice of lamp, and also offer long lifespans. Because LED light is naturally directional, GLS lamp designs usually involve the use of multiple LEDs for omnidirectional output. The ‘yellow’ bulbs sometimes seen use a remote phosphor to create white light; the yellow disappears once the bulb is switched on.
Applications
Standard GLS bulbs are widely used in table lamps, desk lamps, and many types of shaded ceiling pendant. In more compact light fittings a similar but smaller ‘golf ball’ bulb is typically used, and in open pendants the more decorative candle bulb is preferred.
A classic ‘household bulb’, the GLS bulb is also sometimes manufactured with a tougher glass and a reinforced filament for industrial use. This variation of a GLS bulb is known as a ‘rough service’ lamp, or bulb, and is designed to better withstand vibration and shock.
Caps
Large bayonet (B22); Edison Screw (E27).
-
Osram 21W Warm White Dimmable LED Frosted GLS Bulb - Screw Cap
4 Year Guarantee
From: £10.99 ex.VAT
-
iDual 11W Colour Changing Dimmable LED Remote Controlled GLS Bulb - Screw Cap
5 Year Guarantee
Was: £13.72 ex.VAT
Now: £7.99 ex.VAT
-
iDual 7W Colour Changing Dimmable LED Remote Controlled GLS Bulbs with Remote Control - Small Screw Cap - Pack of 2
5 Year Guarantee
£33.29 ex.VATMore Info -
Philips CorePro 8W Warm White LED GLS Bulb - Screw Cap
2 Year Guarantee
From: £3.32 ex.VAT
-
Philips CorePro 8W Warm White LED GLS Bulb - Bayonet Cap
2 Year Guarantee
From: £3.32 ex.VAT
-
Philips 6W Corepro Warm White LED GLS Bulb - Bayonet Cap - Pack of 5
1 Year Guarantee
£11.50 ex.VATMore Info -
Philips 5.5W Corepro Warm White LED GLS Bulb - Screw Cap - Pack of 5
1 Year Guarantee
£11.50 ex.VATMore Info -
Crompton 5W Warm White Dimmable LED Decorative Filament GLS Bulb - Screw Cap - Pack of 5
2 Year Guarantee
£24.00 ex.VATMore Info
-
Crompton 5W Warm White Dimmable LED Decorative Filament GLS Bulb - Bayonet Cap - Pack of 5
2 Year Guarantee
£24.00 ex.VATMore Info -
Crompton 7.5W Warm White Dimmable LED Decorative Filament GLS Bulb - Screw Cap - Pack of 5
2 Year Guarantee
£27.50 ex.VATMore Info -
Crompton 7.5W Warm White Dimmable LED Decorative Filament GLS Bulb - Bayonet Cap - Pack of 5
2 Year Guarantee
£27.50 ex.VATMore Info -
Philips 13W Corepro Warm White LED GLS Bulb - Bayonet Cap - Pack of 5
1 Year Guarantee
£27.50 ex.VATMore Info
-
Philips 13W Corepro Warm White LED GLS Bulb - Screw Cap - Pack of 5
1 Year Guarantee
£27.50 ex.VATMore Info -
Integral 9.5W Warm White LED GLS Bulb with Dusk to Dawn Sensor - Bayonet Cap
2 Year Guarantee
From: £5.19 ex.VAT
-
Integral 8.5W Warm White LED GLS Bulb with Dusk to Dawn Sensor - Screw Cap
2 Year Guarantee
From: £5.19 ex.VAT
-
Integral 9.5W Daylight LED GLS Bulb with Dusk to Dawn Sensor - Bayonet Cap
2 Year Guarantee
From: £5.19 ex.VAT
-
Integral 9.5W Daylight LED GLS Bulb with Dusk to Dawn Sensor - Screw Cap
2 Year Guarantee
From: £5.19 ex.VAT
-
Philips 8.5W CorePro Warm White Dimmable LED GLS Bulb - Screw Cap
2 Year Guarantee
From: £4.74 ex.VAT
-
Philips 8.5W CorePro Warm White Dimmable LED GLS Bulb - Bayonet Cap
2 Year Guarantee
From: £4.74 ex.VAT
-
Philips 13.5W CorePro Warm White Dimmable LED GLS Bulb - Screw Cap
2 Year Guarantee
Was: £7.99 ex.VAT
Now: £4.65 ex.VAT
-
Crompton 1.5W Amber LED GLS Bulb - Bayonet Cap
3 Year Guarantee
Was: £3.19 ex.VAT
Now: £2.33 ex.VAT
-
Crompton 1.5W Green LED GLS Bulb - Bayonet Cap
3 Year Guarantee
Was: £3.19 ex.VAT
Now: £2.33 ex.VAT
-