question in Building Construction Illustrated (1)

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    Hang Cho

    #1. watch this.

    https://www.youtube.com/watch?v=0Az05_jzgNw

    #2. What this graph tells are how efficient each light fixtures are in comparison. so it is more efficient toward bottom-left & less efficient toward top-right. (I recommend watching amber video!.)

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    Yanrong Gao

    Dear Mr. Cho,

    Thanks for the video for #1 question. It's very helpful. For #2 question, I didn't subscribe amber video so can you explain here or is there video on youtube also? Many thanks!

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    Hang Cho

    video @ #1 is the part of amber video on youtube (free).

    the curves illustrate how partial wavelengths fluorescent fixture produce compared to incandescent fixtures and even more to sunlight. when the wavelengths are even, it is closer to sunlight which has high CRI.

    for some reason, curves in incandescent show more even wavelengths than fluorescent but lower.

    focus on number below CRI in your image & amber video. fluorescent is CRI 85 which is pretty high.

     

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    Yanrong Gao

    Hi Hang,

    Thanks for your message. But I still have questions about the chart. I see the curves of the cool-white and warm-white fluorescents are the same. I think the cool-white fluorescent's curve should have a peak at short wave light (cold light), but it doesn't.

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    Hang Cho (Edited )

    Yes -  the cool-white fluorescent's curve have a higher peak at short wave light (cold light) - look close.

    Here is another resources.

    http://www.lamptech.co.uk/Documents/FL%20Phosphors.htm (just look at colored graph & compare warm white 29-530 vs cool white 33-640)

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