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I grew many years ago....back then the debate was fluorescent or MH. I'm in the Aquarium Reef hobby now and it is going through the exact thing you growers are experiencing. Coral has been grown in tanks for years under MH lighting with impressive results. Like growing, heat is a major...

48" lights will not fit in a 39"x39" grow cab! I've rigged up some CFL's to use for sprouts and clones, but for the first batch, they are getting 1400 lumens of light.

2 week old seedlings are yellowing from the center of the leaf out. Seedings were sprouted in a Burpee starter tray. I've been watering with PH'd water very sparingly. I can see roots in holes in the bottom of the starter tray, so root development seems normal. I've not added any nutrients to...

I found that using one of the weather station temp monitors is not a very accurate way to measure the temp. I used an infra red temp sensor and found the tops of the plants at two feet from the light (with cool tube) 80 degrees.Something else interesting, with the portable air conditioner, they...

Hello all! I'm new to posting, but have been reading for months now. My question: is there any problems other than heat for seedlings to start out under the HPS instead of CFL's? How high above the seedlings can I go before they start to stretch? I'm trying to keep the temp down. At two...