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Thread: Linear LED Replacements are Junk - UC Davis Study

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    Linear LED Replacements are Junk - UC Davis Study

    Linear LED Replacements are Junk - UC Davis Study

    http://www.ecmweb.com/lighting-contr...ts-performance
    Roger Ramjet NoFixNoPay

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    Is it worth registering to be able to read it?

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    Quote Originally Posted by MAC702 View Post
    Is it worth registering to be able to read it?
    If the topic interest you, registration is free.
    Roger Ramjet NoFixNoPay

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    Quote Originally Posted by ramsy View Post
    If the topic interest you, registration is free.
    And if it doesn't interest you they charge?
    The more they overthink the plumbing, the easier it is to stop up the drain

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    Quote Originally Posted by dkidd View Post
    And if it doesn't interest you they charge?

    I always laugh when I see classified ads that say "Call xxx-xxxx if interested." I think to myself " What number do I call if I'm not interested."

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    Quote Originally Posted by ramsy View Post
    Linear LED Replacements are Junk - UC Davis Study

    http://www.ecmweb.com/lighting-contr...ts-performance
    Great stuff ramsy. It looks like linear LEDs that run on only their designed driver compare to linear fluorescents.

    https://cltc.ucdavis.edu/sites/defau...02017-11-1.pdf
    Ravenvalor
    Electrical Contractor
    Piedmont Region of NC

    "Good day and good premises." (Ayn Rand)

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    Quote Originally Posted by MAC702 View Post
    Is it worth registering to be able to read it?
    You don't have to register to read the study and there is a link to it in the article. Here is the link to the study.

    https://cltc.ucdavis.edu/sites/defau...02017-11-1.pdf

    The study says that linear LED lamps are not as bright as linear fluorescent. They tested the 4' T8.
    There was one exception where LED out performed fluorescent though. In a wrap around fixture the trapped heat reduces the lumens of the fluorescent thus making it less brighter than the LED but only in the type of LED that has a separate driver and not integral with the lamp. It does not necessarily have to be a lamp that fits into a socket I believe. I imagine it can be some sort of a strip or a lamp that connects to a driver in the fixture. (Note: driver and not fluorescent ballast). Furthermore they say the driver has to be specifically designed for and listed for the lamp and vice versa.
    I have been looking for this type of system and cannot find it. Does anyone know where I may find a well made system like this?

    Thanks,
    Ravenvalor
    Electrical Contractor
    Piedmont Region of NC

    "Good day and good premises." (Ayn Rand)

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    Sort of an aside. I have 4 foot fluorescent fixtures in my garage. They don't work real well when it is -13 like it was this morning.

    Is there a better option? Like an LED replacement?
    Bob

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    petersonra:

    Thr LED chip itself will work well at low temperatures. Funtion will be driver dependent. But quality LED fixtures should be good. Look at their temperature specifications.

    Fluorescent bulbs use a gas(s) plus mercury to generate UV to excite the phosphors. This mixture is quite sensitive relative to temperature, for electrical characteristics, and UV emission.

    I switched to LEDs ouside in place of CFLs and results have been good.

    There are problems with some LEDs on quality and RFI noise.

    .

  10. #10
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    One interesting point that I had not previously given enough attention to is the more strictly downward direction of light from the LED tubes.
    I had seen it as a potential efficiency boost because the diffuse reflection from the backing surface of the luminaire caused a wastage of some light.
    What I had not considered was the balancing advantage of the distributed light source of the reflector makes for a less glaring light source with less of a point light source and therefore less harsh shadowing. For some work environments that is a big factor.

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