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How much are chillers? I was just wondering about making one out of an old window a/c by cutting the evaporator lines and reconnecting with flexible hose then placing the evaporator in the rez and extending the thermostat into the rez as well. Just disconnect the evaporator fan. I think I'd try...

I'm designing an aero system and came up with an idea for an easy to make backup pump system that will automatically switch to a second pump in the event the primary pump fails due to for example mechanical failure, internal electrical failure or clogged filter. I know what I want it to do for...

For starters, now-a-days they have ballasts that are switchable MH/HPS so no need for expensive conversion bulbs, either MH>HPS or HPS>MH--use one ballast for veg and bloom. And I doubt you'll buy a 1000w bulb for $10, closer to $100. A great reason for using a smaller bulb is for economy &...