if i dont use a heat lamp it will be less than 30 degrees at night and a maximus of 50 degrees during the day.. i have my heat lamp about 3 feet away from everything just giving it enough warmth now
What kind of lights are you using.... ? HIDs should provide plenty of day time heat... if yo are going to get a heat lamp or heater you shuld just get an HID.. it will heat your room and YOUR plants will benifit greatly..
rule of thumb.. add lights, not heat... of course there are exceptions
well i already have 8 100w cfl daylights and thats workin fine my heat lamp is like 3 feet away i dont need to spen more money on a hid light within 3 to 4 weeks i will be using a 600w hps light and that will give a good amount of heat