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1. Is it possible to get a surge protector (or something) that has maybe an hour or so of backup power in case of an outage? (Something like a mini UPS)
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almost all UPS have surge protection built in however you would need a not-so-mini UPS to supply enough power to run your lights for more that a few minutes. UPS's are only designed to run a computer for long enough to save your work and safely shut down. If you're going to go that route then only plug in a few power heads and maybe a heater into the UPS. Your tank can do without lights for a few hours.
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2. I'm trying to affix my (new!) AquaLine OceanLight 250 HQI pendants on to my canopy's fold-up lid. Thinking of using galvanised steel L-brackets. Does this make sense? Will this rust out or rot the wooden lid?
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Galvanised steel will rust eventually, so will stainless steel. Use brass.
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3. I'm planning on attaching some fans to the back part of my canopy (fairly large open space in the back) for cooling down the HQI pendants. If I get maybe four computer fans, does anyone know if I can wire them all to a single plug?
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Computer fans are generally 12Volts DC so you will need an adapter or 'wall wart' to run them. As long as the TOTAL current draw for all the fans does not exceed the current the wall wart can supply then they can all be hooked together. 120V AC fans are better and can all be hooked to ione plug without any problems. (With both AC and DC fans, make sure they are connected in parrellel) Also, Install all your fans blowing IN not out. Blowing is more effective than sucking and this avoids drawing moist, salt laden air thru an electrical component.
Just my $0.02