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Yes 120cm²/ heat W for passive cooling friendly profiles and 40cm²/heat W for active cooling is a guideline. The calculation I mentioned above...
The 10"X36" is 16900cm² so that is good for 140W of heat passive cooled. 14 CXB3590s @ 700mA = 320 dissipation W * .437 = 116W of heat. So...
Not recommended for most DIYers, but you don't have to stop at 56.3% efficiency. If you have a serious heat problem, expensive electricity rate or...
Nice DIY thread you have going here : ) In 2009 the best DIY grow lamps were 26% efficient and cost $15/PAR W, but they worked great for closet...
Had to resurrect this. I made the mistake of killing hundreds of these white worms thinking they were FG larva. Big mistake. As Stankie correctly...
Many plants mature more slowly when exposed to high canopy temps. The taller colas are closer to the light and hotter so that may explain why they...
I compared my ez widers against my friends zig zags and the ez was a lot thinner. So if you are in a pinch for thins ez wider should be easy to...
Hi LD, thank you for sharing your soil mix and advice it is very interesting stuff! I use a dry fertilizer based on feather meal and poultry...
If you are serious about building your own LED lamp get in touch with KNNA for info and parts. He buys top binned LEDs in bulk tests them and...
One thing to keep in mind for that 133cfm fan is that it draws .6 amps which is quite a bit more than most AC-DC adapters put out. You could run...
That was a good read I don't know how I missed it before. I have noticed that if I add plain peat to my R/O it works great as PH down. They sell...
Ya itsa 27 watt fluoro. Decent if you are flowering a tiny plant. You can get 26 watt GE fluoros at Walmart for about $2-3 each.
As far as spectrum goes a common misconception is that plants do not use green photons for photosynthesis. Yes it is true that plants reflect...
Good discussion here. Lumens are fine for comparing bulbs but only if they share the same exact spectrum (they rarely do). There are a few...
I am wondering the same thing. I checked out a bunch of molasses nutrition labels and there is a huge variation from one brand to another. For the...
Hmm I'd say those are a hybrid of DJs Blueberry crossed with Neville's Haze male. I'd hang on to those!
Too true. As far as I have seen the 90w UFOs actually dissipate ~60 watts in the LEDs. To make matters worse they are probably low efficiency...
If you want to get high efficiency you could build a PLL fluorescent system for $100. However, as the previous posters stated, you don't need much...
Sometimes the new growth on a clone is miniaturized but treat it nice and it should resume normal growth.
You could maintain a clone in a dixie cup with a 6 watt fluorescent for months (could probably maintain a handful of them that size). As long as...