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"Steve Harris" wrote in message ... In article , (Franz Heymann) wrote: My problem is essentially to find out quantitatively how many lamps, of what power, at what distance from the plants, to use. Last winter, I couldn't find definitive information either. In the end I used a single 21W "energy saver" bulb no more than 9" away from some seedlings and got reasonable results. That's a starting point any way. I presume that would do for one small seedtray. Just my luck: the biggest energy saver I could find today was 16 watts. {:-(( The other possibility seems to be one of the very high power halide lamps. I have an unchecked idea that one needs around 1000 lumens per sq. metre. One of those high powered halogen bulbs of 200 watts suspended at 50 cm above the table should be able to serve an area of roughly 50 x 50 cm. I'll try to look if its spectrum is reasonable. Franz Franz |
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