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Kosnic 9W LED 4 Pin DD Bulb

Item code: 10831

2 Year Guarantee


The Kosnic 9W LED 4 Pin GR10Q Lamp is a direct replacement for a fluorescent 2D low-energy equivalent, offering around 44% in energy savings and a 30,000 hour lifespan.

  • 9W equivalent to 16W
  • Retro fit for low energy double D bulbs
  • Instant start
  • Average life 30,000 hours
  • Size: L 145 x W 145mm
See Full Description
£13.99 ex.VAT

*Expected delivery date

Friday 18th October

Order by 7:45pm Today for delivery on Friday 18th October

More Info

Code Unit Price ex.VAT Stock Qty Buy
1-9 10+
£14.99 £13.99
Available on backorder


The non-dimmable Kosnic 9W LED 4 Pin GR10Q Lamp is designed as a direct replacement for a 2D low-energy fluorescent lamp. It offers around 44% in energy savings over its rival technology, and lasts 3 times longer than most fluorescent lamps with its 30,000 hour lifespan (measured at 80% of original output).

Installation Videos

If you are looking to replace an electronic ballast or a choke-style ballast with starter, we have 2 installation videos to guide you step by step.

To replace an electronic ballast watch the following video:

To replace a choke-style ballast with starter watch the following video

Some of the other advantages of the Kosnic 9W LED 4 Pin GR10Q Lamp over fluorescent equivalents include: instant full-power start, negligible UV or IR output (less likely to attract insects or cause fading), zero mercury content, reliable low-temperature performance (down to -20°C), shock-proof and vibration-proof.

The Kosnic 9W LED 4 Pin GR10Q Lamp emits 900 lumens of 4000K cool white light in a 120° beam. It is equal in output to a 16W fluorescent low-energy DD bulb, and has a 68 lx measurement at 2 metres. Luminous intensity is 270 candelas.

When installing this Kosnic lamp into a standard fluorescent fitting with a magnetic ballast, the starter should be removed beforehand. With a high-frequency electronic fitting, the ballast needs to be completely bypassed.

The energy-efficiency and sheer longevity of the Kosnic 9W LED 4 Pin GR10Q Lamp will reduce running and maintenance costs considerably.


The dimensions of the Kosnic 9W LED 4 Pin GR10Q Lamp are:

  • Length: 145mm
  • Width: 145mm


Additional Information

Supplier Code KLED09STD/4P-W40
Brand Kosnic
Guarantee 2 Years
Length 145mm
Width/Dia 145mm
Type Light Bulb
Bulb Shape 2D & Double Ds
Energy Rating A
Dimmable Non-Dimmable
Cap Code GR10q
Cap 4 Pin
Watts 9W
Equivalent 16W
Voltage 240V
Lumens 700
Average Hours 30000
Light Colour Cool White
Colour (K) 4000
Bulb Type LED

Delivery Information

Place your order online Monday to Thursday before 7:45pm, before 3:45pm on Friday, or 1:45pm on a Sunday, and subject to availability*, it will be picked, checked, packed and dispatched within minutes. Once your order is on its way, you’ll receive regular updates on its progress, together with tracking information allowing you to monitor where it is on its journey.

How much does delivery in the UK cost?

3-5 day:£0.00 when you spend over £50.00 (excl. VAT)
£3.99 when you spend under £49.99 (ex VAT)
1-2 day:£5.99

Can I get free delivery?

We offer free ‘standard’ delivery to UK Mainland (except selected postcodes) for any order that is over £50 (excl. VAT). This takes three to five working days for delivery.

How does it work for ‘Highlands and Islands’ or overseas deliveries?

* Some products are not available for immediate dispatch. See product page for details. To read more about our delivery service, zones and special rates, visit our delivery page.
Feefo Reviews

Feefo Reviews - Average 67% (3 reviews)

67 3 100
Kosnic 9W LED 4 Pin DD Bulb
Date Score Customer Comment Our Response
30-Oct-2018 Product:
Replaced a 2D bulb with this which failed regularly, a small alteration to the power supply in the lamp holder and this bulb replaces the 3D bulb, hoping for long life now.
09-Feb-2018 Product:
Product good delivery took a week
If I had known this at the time of order I would have purchased from a diffterant supplier
I am sorry you are disappointed with us.  For future reference if you need items urgently, you can choose our "next working day" delivery service.  On...Read more
28-Mar-2014 Product:
a bit more expensive than the bulb it replaced but a fraction of the power and a better quality illumination. I am definitely buying a fe more for other fittings
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