my 1.5 hp 220v chiller sits outside my fish room but in the garage, I wish it was outside since it shuts itself off in the summer due to the garage overheating and there is a pressure over ride switch on the chiller that turns it off. so I have to run an evaporative cooler blowing on the chiller 24/7 to prevent if from shutting off. I will have to move it outside or build a vent over it to exhaust the hot air that blows out of it.
as for lights I use a waterproof florescent light fixture, bought cheap at HD, all in one. Heat is a big issue, along with moisture. I plan to install a separate ac for the room before summer.