Corn dont need light, Its optional. My Milksnake (Similair to a corn in husbandry) I have a Heatmat connected to a thermostat and i also have repti glo 2.0. Corns dont need UV light, But it was my option. It lightens up the vivarium for you to see, it can also help the snake have a body clock of roughly what hours it is in the day. But naturel sunlight from the room is enough. It's just my oponion in having it.
A heatmat alone will be fine at night. As they don't heat the air much the snake will still have the option of a cool area with normal night temperatures or a warm spot, which it'll probably make use of at night when it's just fed.
The heat mat must be on a stat though - otherwise it'll be too hot and the snake will, at best, avoid it or at worst, get burnt.
The wattage of the bulb for daytime temps depends on the size of the viv. For example, in a 36x18x18 you'd need either a 60w or 100w depending on how warm your house is.
I wouldn't bother with UV for a corn, or any snake TBH. Corns are crepuscular (mainly active at dawn and dusk) so they'd most likely avoid any bright light and so wouldn't benefit in any way.
Was wondering why you put a link to an American stat then noticed the location in your profile!
If you're in the US then forget the habistat stuff as I believe it'll all be the wrong voltage.
The one on your link looks fine but you don't really need one that can handle up to 1000w - a rating of 100w should be fine for a heat mat/pad so if you shop around you may find one cheaper.
personnally i have found that heat mats don't really make the cut compared to heat bulbs... for my corn's tank i have both. i ahve set the heat mat to 26C and the heat bulb is on in the days at 30C... those snakes are thriving....
lol nige. Well as you can see nige doesn't need bulbs, just ok on mats, just depends on your personal preferance. Most of my snake are on either bulbs or mats you know, but my a few special one are on both. As for which bulb, i always tend to buy a 60w tbh, a 100 might be too hot. Best thing would be to do away with bulbs and mats and get a ceramic heat emmitor. look it up on the net or something and see the prices on ebay and stuff. as i say you can get away with either or both if needs be. Just defo have a thermostat. and a couple of thermometers in the tank. goodluck.