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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Products: LUX review of GU10 LED lamps

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  1.  
    • CommentAuthorrhamdu
    • CommentTimeAug 19th 2015 edited
     
    LUX magazine has lab-tested 11 GU10 LED lamps http://luxreview.com/review/2015/08/led-gu10-lamps

    They appear to have only taken one sample of each, and you won't find out which lamps are most consistent or reliable. But they have measured the bulbs' technical performance with almost ridiculous precision. 3979K colour temperature, anyone?

    They wisely advise 'Before you buy the lamps, you should check what the beam looks like. Some have coloured edges or don’t have a smooth gradation of light from the centre to the edge.' I agree with that.
    •  
      CommentAuthordjh
    • CommentTimeAug 19th 2015 edited
     
    Posted By: rhamduThey wisely advise 'Before you buy the lamps, you should check what the beam looks like. Some have coloured edges or don’t have a smooth gradation of light from the centre to the edge.' I agree with that.

    Interesting read; thanks for pointing it out. I bought samples of a whole bunch of GU10s and the beam colours turned out to be the deciding factor. It's not just the edges that are coloured either, some of the lamps have coloured streaks throughout the beam. Blue and yellow candy stripes - very disconcerting. In my case I was looking for daylight lamps, which led to a different set of candidates. I chose to buy a make LED magazine didn't test - Crompton 5W LED GU10 COB Non-Dimmable.
    • CommentAuthorCWatters
    • CommentTimeAug 21st 2015
     
    I have at least four different makes of GU10 in our kitchen and several others around the house. They are all essentially unbranded makes off ebay. All made from 24-27 of the 5050 form factor LEDs, are "warm white" and claim to produce >400 Lumens.

    Sure they are very slightly different shades of white but I've never noticed any issue with "coloured edges" or "stripes" or not having a "smooth gradation of light" .

    I'm wondering if this is only an issue for lamps made from 1 to 3 LED die that use a lens to get the beam angle? Lenses can introduce colour aberrations sometimes.
    •  
      CommentAuthordjh
    • CommentTimeAug 21st 2015 edited
     
    Posted By: CWattersSure they are very slightly different shades of white but I've never noticed any issue with "coloured edges" or "stripes" or not having a "smooth gradation of light" .

    I'm wondering if this is only an issue for lamps made from 1 to 3 LED die that use a lens to get the beam angle? Lenses can introduce colour aberrations sometimes.

    The effects I see are not lens aberration. It seems quite clear that the blue and yellow haven't been integrated properly. The samples I bought were all branded, because I want to be able to buy more, and in some cases they are fairly well known names. They were a mixture of SMD and COB designs.

    Oh, and it is a lot easier to see the effects if you shine the lamps at a plain white area.

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