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"Martin" wrote in message ... On Sun, 19 Sep 2004 16:31:13 +0000 (UTC), "Franz Heymann" wrote: "Martin" wrote in message .. . [snip] perhaps this http://www.hydroponics.com/light/growlamps.htm I had a look I think they are trying to pull the wool over my eyes, unless there is something fundamental which I misunderstand. I thought the light was only used by the plant for photosynthesis of carbohydrates from CO2 and water. So why do they waffle about spectra which are adjusted for good fruiting versus good vegetative growth? dunno I am not an expert on the subject. Maybe Jenny knows more? From observation of light emitted from green houses, most of the lamps used *appear* to be sodium vapour lamps i.e the sky is a sodium colour at night in these parts. It's particularly noticeable if you approach Schiphol by air from the south. That's weird, because sodium lamps give little more than the yellow Sodium doublet line, and photosynthesis requires both red and blue light. {:-(( I have little faith in an organisation which thinks the plural of "wattage" is "wattage's" Don't confuse scientific knowledge with basic literacy. :-) Some of their internal links don't work. I'll do a bit more googling and try to find out what the average marijuana growing Dutchman in the street uses; or I'll check the rubbish skips after the next police raid. Do you mean "growing Dutchman in the street" or "Dutchman growing in the street"? Franz |
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