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    Thread: Question about measuring light

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      Default Question about measuring light

      I have only used fluorescent light for vegetating and HPS for flowering. I have one of those no-batteries-required Hydrofarm light meters that gives me readings in foot-candles. I've been doing some research, but I am hitting a bit of a dead end.

      If I use that meter to measure light intensity coming from my HPS, am I just measuring the visible spectrum?

      I have plotted and attached two graphs. One is of an enhanced spectrum HPS and the other is an enhanced spectrum Metal Halide. On the graphs are superimposed the PAR/plant sensitivity curve and the human-eye visible spectrum curve. IF my hydrofarm meter measures just the visible spectrum, then it appears to me that the meter would decently represent light coming out of a HPS bulb, but it would only measure about half of the light intensity coming from the spectrum of light emitted by a Metal Halide.

      Also, do the lumens the manufacturer's report on their technical specifications reflect the entire spectrum or just the visible spectrum lumens? If it is just the visible spectrum lumens, then I am thinking that those enhanced spectrum metal halides are far far superior to any enhanced spectrum HPS.

      Let me know where I am wrong.
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