LED: 2500K is the new 2700K

Singapore, 24th July 2014

Something that has been bugging our team for a long time is the notion that incandescent light colour has to be 2700K. While manufacturers have been improving day by day in getting us good colour consistency we have been plagued by visual feelings that the 2700K colour temperature that has been the benchmark for the colour of incandescent light, really does not feel that warm when it comes to LED. We find that LED in 2700K feels like 3000K and that LED 3000K really feels like 3500K or thereabouts. We have found this time and again when inspecting completed lighting installations.

So over the last couple of months we have embarked on some search and test missions to get the better of our frustrations. We had another such test yesterday with a specific lamp manufacturer and tested what is being marketed as 2700K as well as 2500K and 2200K. As it appears manufacturers are also coming to grips that in LED technology 2700K does not look that warm and you will have noticed the 25000K and 2200K lamps appearing on the market.

I, for now, am convinced that if we need warm light for LED to produce a  matching feeling to incandescent lamps we need to specify 2500K maximum and in some cases even 2200K. The visual impression is overwhelming and very convincing. We are continuing our research and testing with other manufacturers but our findings so far are quite conclusive. While down lights may still work reasonably well with 2700K temperatures, when it comes to table, floor or wall lamps we will now use 2500K and when it comes to pendants and chandeliers even 2200K to get that nice warm feel.

With the same process we are investigating the use of clear and frosted LED bulbs as some applications like chandeliers need that sparkle. Different LED technologies also create different brightness patterns in light bulbs. Do you want a diffuse looking light bulb or do you want a frosted bulb with a clear hotspot. Supporters will argue this is reminiscent of the filament…Oh, if only life in lighting would be simple… 🙂

Light watch 5-122: The pictures of the testing may not be as convincing as a photo does not capture things like our eye does, but I think these series of pictures says it all.

2700K vs 2500K

2700-2500K comparison

2200K vs 2500K

2200 vs 2500K

2200K 2700K 2500K compared

2200 2700 2500K

SMD(base) vs COB LED (centre)

different LED technology SMD vs COB ctr

LED clear vs frosted

clear vs frosted glass

 

24. July 2014 by Martin Klaasen
Categories: Light & Learn, light watch, lighting and culture, lighting applications, lighting design, lighting standards | 6 comments

Comments (6)

  1. Yes, the lower K LED bulbs have a field of use. There is a bright scream in replacing street lighting with the lower K realm for less light pollution also. For indoor, the dimmable LEDs have caught attention.

  2. Where do you get 2200K 2500K LED bulbs? I can’t find them on the web. And if you can find them where can you find them in a dimmable version?

  3. Is it possible to get LED strip lights for cove lighting that approximate an incandescent look?

    Acolyte LED has a tunable 3-color LED strip that is very good but also very expensive and very complicated to use. It has three colors–white, warm white, and amber–that are manually dialed to get the desired mix.

    Maybe there is something like this in the U.K. or EU?

  4. bonjour Monsieur ,
    can you tell us address company
    to import in france lights for interior and exterior led 2200k 2500k and 2700k ?
    thanks.

  5. I knew it! I always thought those 2700K bulbs were very white. Maybe people have been mistaking low CRI for too-low color temperature? Alas, I’m not allowed less than 2700K according to Title 24. They can’t regulate my floor and table lamps, though.

  6. Thankyou Martin. What amazing insights! Complete with photos! Bookmarked.
    Yes, I agree 2.7 k is not all that warm subjectively. Fine in my day studio, but cosy bedside lamp it is not.

    B&Q have an own-brand ‘filament’ type bayonet LED which looked to be warmer, just, but two broke up internally almost immediately. Hunt is now on to find those elusive 2.2 or 2.5 you mention, in durable format, and at 75 or 100W equivalent.

    While here, I wonder if you’ll be addressing an alleged shortcoming of LED healthwise (Google Dr Mercola)? He says that our skin needs far infra red, and if we don’t get sunshine (UK!) or include some incandescent, we might be deprived. LED domestics don’t emit far infra red, do they? Would not be so energy efficient anyway.

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