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oh man... I hope I don't get flamed for resurrecting such an old thread... if the combined weight of the crop is more than the fluorescents, I'd consider rotating them instead..

on efficiency.. I hadn't said it yet, but lamp efficiency is measured in lumens/watt & there is a problem with this ratio. The major portion of the spectrum we're talking about with lumens... Well, we measure brightness in green & plants don't a shit about green. You have to know the relative...

sales pitch? wtf, good god, no. If you look at the graphs I posted you'll understand what's going on & why I think it's important. HPS & to some extent MH bulbs provide just enough light for photosynthesis. There's nothing wrong with them, they do work. But if you really want your plants to...

but that's what I'm saying. You can't just mimic the sun. You also have to mimic the planet. Sunlight travels through the atmosphere & throughout the day the atmosphere changes the spectral properties of sunlight. So if you want to mimic the outdoors, you can't just use one bulb.

Don't forget. 0% interest on all amazon orders when payed within six months.

I'm not trying to say anyone should replace any other light source. I'm saying that halogens are going to produce hella-red light. HPS may be able to produce more light, but is that additional light usable in the biological processes of a plant? For the most part, NO. HPS doesn't even come...

whatshuh? I didn't call anyone a dummy... bad form Peter.

I suppose I should share these graphs, I'm loosing my train of thought.They show the three main HID lamps & how they effect plants. MV is the yellow line, HPS is the red line & MH is the blue line.& here's the downlow on halogensAS you can see, metal halides are more than adequate in the blues...

lol, yeah... actually, I have a 70 watt HPS & a 175 watt MV. Got halogens in the ceiling fan though...

Oh, & yes, halides provide a broader band of blue light, but the amount of energy in that light is much, much less than that of a mercury vapor.(damn thing wont let me edit...)I had prepared a longer version of the post, but it got lost in forum hell I guess.What I intend to do is to focus on...

Kind of wanting to get the word out on this one because no one seems to realize the truth.Yes, halogen gets hot, probably it's worst quality. If you can manage to cool one of these lamps, guess what... Hands down. Halogen lamps are able to provide the most usable (by chlorophyll) light in the...