Heat cable other than zoo med?

Is there any other heat cable I can use in my vision rack? I need more than the 52ft zoo med brand cable to get the temp to the right level. I want my full eleven levels to get proper heating.

I don't know of any other companies that make a heat cable offhand, but if you had to, you could just use more than one strand of cable.

The zoomed one comes in different lengths...I know there is a 39 foot one that you can buy online, I don't know if there is longer than that though.