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Infra-red doesn't even start until 740nm. That's quite far from 660nm actually. 110nm away. if you subtract 110nm from 660nm you get GREEN. 660nm is only 30nm farther up the scale than 630nm which is where red only BEGINS. 660nm is in the beginning of the deep-red zone which goes all the...

"Most photomorphogenous processes of terrestrial plants are controlled by bright red and an alternation between red (lambda = 660 nm) and far-red (lambda = 730 nm) light. The accompanying receptor is phytochrome, a protein-chromophore-complex existing in at least two different states that can...

Have you not seen the spectral absorption graph for terrestrial photosynthesis? When the seasons change, the sun is lower in the sky. It makes the overall light spectrum a bit more red heavy. Plants respond to this by taking in more carbohydrates and speed up the photosynthesis process. They...

That's true, heat sucks!!!!!!!!!!

Post removed by user, no bud porn for you!!!!!!!!!!!!

Wow, sure got quiet in here fast huh?!

Today I installed the two Kessil h150 Red LEDs on a 45 degree downward angle on to the canopy. Here is what the canopy looks like now with the addition of the red leds, Much more red-purple! Before adding the Red LEDs After adding the Red LEDs Note the color change. Hyroot, I now see this...

No, lenses are pointless from what I've read because all they are doing is blocking some of the spectral output. Like how UVb gets block through glass.

Are you sure these will grow cannabis? Looks like they are growing lettuce from the manufactures photos and using them as supplemental lighting to extend the photoperiod for strawberries, not using them as the main source of light. I can't even find where it gives the wattage for those single...

Interesting article on UV light and what it can do for you and your plants, http://www.semiconductor-today.com/news_items/2009/MAY/USDA_260509.htm

I'm feeling that they don't need any more food from here on out(unless someone says otherwise), but is there any other sort of non-nutrient type of additive or booster that would be good to mix into the water, or STRAIGHT PH'D RO WATER ONLY? I've always kinda been unsure at this point what to...

Well, I just started straight H2O watering, do you think that this is a good time to start H2O only, or should I keep givin em something to eat? And what should I fed them at this point?

The calyx's never seem to fill up as much as they should when I grow. Is there something that can be done to get the calyx's to swell more?

400w HPS + 400w Horti Blue update,

Oh, right on then! I had no idea about the 250 CMH. I'm sure it would work well. Here is a photo of a bud that has been growing under a 400w HPS + 400w Hortilux Blue, (roughly 6 inches tall),

They don't make a 250w CMH do they? A 400w CMH + 400w HPS would do fine. Right now I'm running a 400w Hortilux Blue MH + 400w Hortilux HPS + UVb. I did try the CMH + HPS before, but I liked the color rendition from the HPS + MH blue better. I can't say one way or the other if one mixture is...

A gimmick? CMH bulbs were made for the warehouse lighting industry. They happen to grow plants as well. I think it's pretty obvious that CMH bulbs grow plants differently. I wouldn't call it better or worse, just different. Actually, plants require a range of wavelengths in order to grow...

No problem, it wasn't a question. I was merely adding useful info to finalize this debate of whether or not CMH have their place in the gardening industry. I was just simply stating that CMH bulbs emit a balanced Red Green and Blue spectrum(therefore white) and although work well in their own...

Wait, isn't the title of this thread "Using T5's without LEDs"?

I like this idea. With the correct LED driver you pretty much could make a christmas light like string array with 20 or so 5 watt 660nm LEDs inbetween your T5 bulbs and just glue the LEDs right onto the fixture. Might want to consider those individual LED heat sinks or a fan blowing on your...