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I use 2 600s in cool tubes on the same circuit without a power or temperature problem. If you're plugging into standard outlets on the U.S. power grid, the 2 600s and the 85w CFL will pull around 11 amps @ 115v. Check the fuse or circuit breaker for the circuit you're using.... its a good idea...

I'm brand new here and only been growing in soil for about 18 months... but I've been using Grow Big, Tiger Bloom and Big Bloom the whole time with good results. I usually start at half of the feeding chart recommendation and work up from there with each set of plants. Grow Big can be a little...