ive just seen a advert on ebay for a exo terra corn snake starter kit.in ti has some good stuff but what is a sun glow and night glow bulb is it a heat light or just a normal everyday bulb and what is the night glow bulb.i know that heat rocks are very dangerous so thats a definate no go for me.just wanted to know what theye was as im going to build a viv for my 2 adult corns and wonderd if it was a good idea to buy them seperate and fit them or not