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    Lumens, Lux, and Adding It all Up

    Not sure if it's helpful, but I found this video on measuring lux with a DSLR camera. https://www.youtube.com/watch?v=_xU0pWjugTo
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    Budget led

    If you are on a real budget you could try building one of these? white light rather than red/blue but so are CFL's, and HPS are too (really, they are) as are MH. $0.60 per watt isn't bad, and with 3w diodes. https://www.youtube.com/watch?v=l2iMFPiltf0
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