Sounds like a bit of overkill Pepito, maybe just one uvb bulb/tube, and one heating bulb will be enough. If your cage is not very tall, you want the minimum amount of heat that will be sufficient for your lizard, since a short 24"(vertically) cage wont offer much of a range of temperatures.
Depending on how cool your room gets overnight, you may not need the night heating at all. You dont say how hot its getting in your cage mate?
If you could provide as much info as you can about the cage and the lizard, we will be able to suggest more suitable conditions/changes needed to give your lizard the best possible environment.
If you can add your answers with these questions (cut and paste), this will help much.
Chameleon Info:
Your Chameleon - The species, sex, and age of your chameleon. How long has it been in your care?
Handling - How often do you handle your chameleon?
Feeding - What are you feeding your cham? What amount? What is the schedule? How are you gut-loading your feeders?
Supplements - What brand and type of calcium and vitamin products are you dusting your feeders with and what is the schedule?
Watering - What kind of watering technique do you use? How often and how long to you mist? Do you see your chameleon drinking?
Fecal Description - Briefly note colors and consistency from recent droppings. Has this chameleon ever been tested for parasites?
History - Any previous information about your cham that might be useful to others when trying to help you.
Cage Info:
Cage Type - Describe your cage (Glass, Screen, Combo?) What are the dimensions?
Lighting - What brand, model, and types of lighting are you using? What is your daily lighting schedule?
Temperature - What temp range have you created (cage floor to basking spot)? Lowest overnight temp? How do you measure these temps?
Humidity - What are your humidity levels? How are you creating and maintaining these levels? What do you use to measure humidity?
Plants - Are you using live plants? If so, what kind?
Placement - Where is your cage located? Is it near any fans, air vents, or high traffic areas? At what height is the top of the cage relative to your room floor?
Location - Where are you geographically located?
Current Problem - The current problem you are concerned about.
Pictures are helpful