Alistair
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I have a Hortilux Blue 400 watt metal halide lamp. On the box it says, "Research shows that spectral energy ratios are more significant than lumens for plant growth". With that said, I'll say that the most lumens this bulb emits is 29,000. However, I'm not sure whether it puts out 29,000 lumens or 22,000 lumens. That is why I've pasted the specs for this lamp. How many lumens does this put out on average? I'd have to say that it puts out 22,000 lumens, but I don't quite understand the performance data.
Initial lumens at rated watts after 100 hours operation 29000 lm
Mean lumens at 10 hours/start 22000 lm
Rated average life at10hrs/start 12000 h
Warm up time, maximum 8 min
Correlated color temperature 6500 K
CIE chromaticity 0.310, 0.349 X, Y
Color rendering index (Ra) 90
Operating Position HOR±15º
Time to hot re-start, maximum 15 max. min
I have about 10.5 square feet of closet and if you take 29,000 and divide by 10.5 you get about 2762 lumens per square foot. On the other hand, if you take 22,000 and divide by 10.5 you get about 2,095 lumens/sq. ft. In either case you don't get the 3000 lumens/sq. ft. minimum for good growth.
Can anyone explain to me how to read the performance specs for lights?
I've used this light for vegetative growth, and it seemed to work fairly well, but because of heat issues I can only get it about 15"-18" from the tops of the plants.
I also have what I consider to be a standard metal halide lamp and I'm not sure about its performance data; I don't know how many lumens it emits. I see no difference in growth between the two lights. However, I only use one light or the other; I don't have both going at the same time.
What do you experts think about this light?
Initial lumens at rated watts after 100 hours operation 29000 lm
Mean lumens at 10 hours/start 22000 lm
Rated average life at10hrs/start 12000 h
Warm up time, maximum 8 min
Correlated color temperature 6500 K
CIE chromaticity 0.310, 0.349 X, Y
Color rendering index (Ra) 90
Operating Position HOR±15º
Time to hot re-start, maximum 15 max. min
I have about 10.5 square feet of closet and if you take 29,000 and divide by 10.5 you get about 2762 lumens per square foot. On the other hand, if you take 22,000 and divide by 10.5 you get about 2,095 lumens/sq. ft. In either case you don't get the 3000 lumens/sq. ft. minimum for good growth.
Can anyone explain to me how to read the performance specs for lights?
I've used this light for vegetative growth, and it seemed to work fairly well, but because of heat issues I can only get it about 15"-18" from the tops of the plants.
I also have what I consider to be a standard metal halide lamp and I'm not sure about its performance data; I don't know how many lumens it emits. I see no difference in growth between the two lights. However, I only use one light or the other; I don't have both going at the same time.
What do you experts think about this light?