A good choice is to use linear UVB lamps. They are shown to produce safer light than the CFL lamps. To help plants grow you should also install a linear 6500K lamp. This lamp will help plants grow because the light it produces is similar to sun light. Since you have all of those domes you could buy CFL (compact fluorescent) 6500K lamps and just use them in those hoods you have. Only issues I see is that sometimes the higher wattage CFLs get hot and can fail, nothing dramatic, they turn off. Anytime I've had a CFL break, the store I purchased it from took it back.
For heat use a PAR20 50w
flood lamp. Do not use a spot lamp because they make a very hot spot of light and the chameleon can get burned. If you can't find PAR20 lamps you can also use normal household lamps.
If I were you, I would buy a linear Zoo Med ReptiSun 5.0 tube, say 18" or 24". Buy the fixture to go with it from lowe's or Home Depot or local hardware store. Then buy 6500K CFL lamps and install them into two of your light hoods. Next get the PAR20 50w Flood lamp and you should be good. Place the linear lamp diagonal from one corner to the other corner. Place the 6500K hoods on the sides of the linear fixture and then have the heat lamp angled like in the picture below.
If you use a dual linear fixture this is a good example:
The reason you don't need the red heat lamps is because they are a gimmick. Yes they make heat and red light, but chameleons can still see them. The problem is that the light produced doesn't look natural and animals won't associate the light as daylight for heat. The companies want you to think that the animals can't see red light, which is part true. They don't see the light as red, they see it as maybe blue or green. Either way, they see light and they aren't good to use for anything except maybe night animals like geckos. I use a very dark red heat lamp for my leopard gecko. I find her 'basking' under it at night on top of her hide. I think she just lights the heat because it hardly makes any visible light (for my eyes).
And the reason you don't want to use the '100w 5.0' is because it is probebly a mercury vapor lamp that isn't good to use on chameleons. They produce too much UVB and heat. The only way to safely use a MV lamp is in a large enclosure and setting it up with a UVB meter and infrared heat gun to take temp readings.