The wattage for your flwr cab is really up to you....but the 600w or a 1k will give you the most penetration to lower growth as opposed to something with less wattage....

As far as heat goes - Get an air cooled good to go with your lamp so you can run ducting with a fan to cool it.... Works great if you loop outside air to run through the lamp and then back outside again.... Will minimize heat in your grow space....

CGI::::::