Have you thought about using heating tape/heat pad in conjunction with a thermostat? This way the heat comes from the ground and it will stay at a perfect basking temp if you have a thermostat set up properly. I use heat pads hooked up to a thermostat and never turn the heat source off - my snakes move from basking spot to cool side when ever they need to. The ambient temps in the cage should be lower so the animal has the option to move to the other side of the cage and decide what works for them.

I do not use any lighting in my snake cages, and I don't rely on a bulb to keep proper basking temps for my animals, I'm sure other people here do - but it just seems like it would cost more money in the long run (with buying new bulbs) and that it would be hard to get proper temps for the snake - I can't say much about this though because I've never used a bulb.

Edit: Getting a misting bottle has worked well for me for keeping humidity up, and its a shame you can't get PAM over there - I've used reptile relief and it did nothing for me