I've heard the arguments that you don't need a light, but that's how I solved the ambient air temp issue. There was no way a UTH could heat up the air to a reasonable temperature without creating a burn threat.
The way I have things set up is probably a little unusual, but it works. When I first got my tank, the only UTH they had was a small one (suggested for 10g, but I had a 20g tank). It wasn't really warming the area enough. So later I bought a second bigger one.
I now have both of them set up, hooked up to the same thermostat with the bigger one on the side of the lamp. The lamp and the bigger UTH cause the heat gradient because once the thermostat reaches the desired temp, both UTH's turn off. Since the lamp is always on though, the left side is always warmer. Gives me a 90-92 warm and 84 cool on average.
Like I said, a bit unorthodox, but it works. For humidity, I just covered the screen with tin foil everywhere except where the lamp is. I can keep humidity up pretty well with almost no spraying required.
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