I know it's best to use a tub and heat the room, but I just have a few snakes and it's not worth it, I keep them in 20g tanks.

I use the zoomed infrared light bulbs http://www.amazon.com/gp/product/B00...A2701FG002WN6Z
But they just go out too frequently, the barely last a month or two. I found them a bit cheaper online than in the pet store, but I'm wondering if anyone knows a good ceramic heater, I'm thinking it might be much more durable? I just don't want it to emit regular bright light since it's on at night too for the snakes. Thanks.