UK Most efficient LED indoor lights?

[davebaxter]

I am looking to purchase LED strip, I will need around half a metre. My aim is to setup indoor table lamp (example idea: franklite TL605). I want it to be as efficient as possible, looking at 2835 LEDs due to them being the more modern solution. What are your recommendations and what is their wattage per meter?

LED Desk Lamp with USB | Franklite | Decorative Lighting for Hospitality, Retail & Commercial

Modern matt black desk lamp with a switch and USB port on the base.

franklite.co.uk

 

[brianmoooore]

The title of this post is the most efficient indoor LED lights. The efficiency of the 2835 tape is just below 150 lumens/watt, but this is surpassed to some degree by the latest filament type GLS lamps at over 200 lumens/watt.

 

[davebaxter]

The title of this post is the most efficient indoor LED lights. The efficiency of the 2835 tape is just below 150 lumens/watt, but this is surpassed to some degree by the latest filament type GLS lamps at over 200 lumens/watt.

How about these leds advertised as 230l/w?

Eg cree (attached data sheet)

 

[brianmoooore]

You will notice that the individual output of the most efficient LEDs on your data sheet is very low compared to the less efficient ones further down the list. It's been found that you get a more efficient lamp if you double the number of LEDs and run each of them at half the power. The output of each LED drops off, but not down to half of what it was, so you get more light for the same input power, but at the initial cost of doubling the number of LEDs. This is what is effectively been done for the latest versions of LED filament lamps - twice the number of filaments, with each run at half the power.