Heating bulb?

What type of bulb should I use for heating my Chameleon’s cage? I’ve used a regular house bulb 75w and I’ve also used the repti daylight blue light bulb. I’ve heard they aren’t good for chameleons. I just wanna use what’s healthiest for my chameleon.
 
I dont know if the blue bulbs are bad for them, just that they do the same thing as a regular incandescent bulb. I think I have 75 watt bulbs on my chams... those are incandescent, not halogen. They are harder to find these days.
 
What is an incandescent light exactly...?
short answer...
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