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Glow-Lux After Glow Tube ?

Discussion in 'Lighting' started by Adam Aglionby, Aug 27, 2003.

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  1. Might be a great idea but the Web site does not address:

    Efficacy - if lower than standard lamps then may be a bad idea.

    Lumen maintenance of phosphor, under both normal operation and the
    "afterglow" part. Yes, I know they say 1 hour of high brightness, but
    after 10,000 hours of operation, for example, does the lamp still
    provide 1 hour of "high brightness" output? And how much light is
    "high brightness"?
  2. TKM

    TKM Guest

    There's remarkably little lamp performance information on the web site and
    I'm curious as to why they took the color/full-spectrum track. Perhaps the
    after-glow operation makes use of some of the new photoluminescent materials
    which are supposedly 30-40 times brighter than the old zinc sulfide
    phosphors. Plus, the new chemistry materials have a faster charge and
    longer discharge times (performance data from the Advanced Lighting
    Guidelines, 2001).

    If so, the new materials have a (best case) luminance of 480 milicandelas/m2
    which equates to roughly 0.5 lumens from a lamp the size of a T8

    There would certainly be some visible light if the power went off; but it's
    well below what a dinner-table candle would provide and not enough for
    emergency lighting requirements.

    Terry McGowan
  3. What about retrofit photoluminescent reflectors? That way the standard
    lamps could be used and the light output from the fixture would still be
    relatively high. It would also allow much more of the phosphor to be
    used for it's afterglow effect.
  4. Well, have you filed the patent application :)
  5. TKM

    TKM Guest

    That's a good idea. I've got some samples of something called "LUNAplast"
    which uses the new materials. The samples are very sturdy and appear to be
    laminated plastic with a relatively high reflectance. They could be
    reflectors or even fastened to ceilings and used with indirect lighting

    Ian Ashdown who sometimes posts to this ng reminded me that he wrote an
    article a couple of years ago on the subject for the IESNA magazine LD+A. I
    found an on-line version at: It includes performance

    Terry McGowan
  6. JM

    JM Guest


    I've personally seen one of these in action. They're less efficiant like any
    other "full spectrum" lamp. And the afterglow part - I suppose if you had
    enough of these in the ceiling, you would get enough light to not get stuck
    in total darkness for a half hour. But at $12 per lamp - ouch.
  7. Having just publicly disclosed my (probably not very original) idea, I
    guess I've blown the patent thing. :)

    If I'd known what some assholes will patent, I'd have got in first with
    my prototype PWM RGB LED colour changer before CK did. But then, given
    that there were hoards of LED sign manufacturers with red and green
    videowalls just waiting for the blue technology to come of age, it was
    hardly considered a patentable concept....
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