A regular 25 W household bulb, which is what the link is showing even tho it's red, won't produce enuf heat. There are people on here who will tell you you HAVE to use RED!!! I'm here to tell you, NO YOU DON'T. I have never used anything but a standard household 100W WHITE bulb & all of my babies have done FABULOUS. No feather picking, they sleep at night like normal chickens, NOT neurotic, etc. etc. etc. Just go buy yourself a 4 pack of 100W household bulbs for $1.25 at Wal-Mart & save a TON of money & headaches.