Heating a new enclosure

[KizamiZuki]

I'm setting up a new vivarium for Marzi. He is growing out of the 3ft viv he had as a baby and I've put together a 5ft viv. He's not in it yet as I'm testing the heating. The 60w bulb is far too cold so I'm trying out a 100w. But does anyone else have a 5ft viv and how do you heat it?

Also had the genius idea to put the top on with hinges to make it easier to open when I need to change the bulb and UV lights