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  1. #761
    pole_pig's Avatar
    pole_pig is offline Laser Safety Officer DX Numbers: 1138 Home Channel: 19
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    Hello fellow minion-destroyers. A note about LED lamps replacing light bulbs and saving money.

    Two GE 4000 Hour PAR38 100W halogen flood lamps were replaced with with two CREE brand LED units, PAR38 "120W equivalent".
    One has an advertised 25 degree beam - says SPOT on the box.
    The other has a 40 degree beam, and says "FLOOD".
    These consume 19 Watts each. 1200 Lumens output.
    They are suitable for wet locations, unlike some of the cheaper units.
    Dimmable so the electronic on/off Triac-based controls work with them.
    These cost just under $10 each, plus theft, er.. tax.

    Switching from a 100W halogen flood lamp to a same-function LED pays for the extra lamp cost in saved electricity in 3 months.
    (based on 8 hours a night, 705 total hours)

    The light quality and coverage is at least as good as the old incandescent lamps -as observed.
    The 25 degree unit is better than the Halogen in this job because it is to light a smaller and more distant area.

    Next: sell the lightly used 4000 HR Halogens to someone who can spend only a few dollars.
    Only 630 and 160 Hours on them. hah pretty much like new.

    The burned out 40W light in the outer vestibule was replaced with a 100W equivalent LED 'light bulb' using 16W and making 1500 Lumens.

    Bright Light is a crackhead repellent. No crackheads in the vestibules.

    No idea how much RFI will be coming from these LED bulbs. That might be a problem.

  2. #762
    pole_pig's Avatar
    pole_pig is offline Laser Safety Officer DX Numbers: 1138 Home Channel: 19
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    The chart shows what can be expected in "Lumens Per Watt" from different lamp technologies.
    In all cases the data is from the manufacturer.

    Note that Watts not converted to visible light are not considered to be converted to Lumens.
    This includes IR, heat, UV and other radiation likely to come from a lighting device meaning a LED, incandescent lamp, arc lamp, etc.

    The Lumen for a given optical power is also directly related to the eye's sensitivity to each wavelength.
    At 555nm, 1 watt is 683 Lumens.
    If there were a perfect lamp radiating equal optical energy from 400-700mn, the Lumen output would be lower at 400 and 700nm and greatest at 555nm where the light-adapted eye is most sensitive. Moving the optical energy output to 507nm with a dark-adapted eye would yield 1700 lumens.

    So.... it's not so straightforward to just do some math, except that manufacturers measure Lumen output of the lamps in a consistent way so that 12oo Lumens from one is 1200 Lumens from the next.

    Anyway we can see that if a 'white' LED lamp makes 95 lumens per Watt, there is still a long way to go to approach the ideal equivalent of 683 lumens per Watt.

    http://hyperphysics.phy-astr.gsu.edu...on/lumpow.html
    http://hyperphysics.phy-astr.gsu.edu...ficacy.html#c1

    Anyway don't worry about all this crap just pick the lamp with a long life and as many Lumens as you want.
    Attached Thumbnails Attached Thumbnails LAMP cfl led COMPARISOn.pdf  
    Electronic Innovations In Action - Setting Energy Traps in the Forbidden Band

    Quote Originally Posted by 4-400 View Post
    lol some goon is mad at me over there...
    Quote Originally Posted by HiDef View Post
    Excellent. Keep up the good work.

  3. Thanks nexus73 thanked for this post
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