In concurrance with some of what has been said ..
Aquariums may not be recommended, the first choice by most, etc, but they can work for small chameleons, and when done well, have their advantages. They do increase risks of overheating, primarily due to the enclosed smallness of them, vs. a screen cage, which is more forgiving of error, air-flow malfunction, etc.
Wattage is not the issue by itself, its how close it is to your aquarium. Frankly, one can not criticize wattage unless they know also how far it is or isn't from your set-up, and more importantly, the basking temperature it has created. If its 3' away, for example, you may have an issue of not enough heat.
Lastly, for an educational tangent, you describe your basking light as this:
... full spectrm 60 watt bulb ....
Please folks, let the OP answer what follows. These are sincere questions for you, Veildchameleon, to answer, and the reader to educate themselves on. You have the product Veild, and you chose the above description. What is "full spectrum" ? Does the label say that, or did you come to that description some other way, and if so, what way, i.e. what criteria did you use to decide it was full spectrum, and if it was the manufacturer, what criteria did they provide for you to validate "full spectrum". What spectrum does it actually cover, in nm or some other measuring criteria ? What is its relative energy per classification by wavelength (Ultra-violet, visible, infra-red)? Last but not least, how much did you pay for it ? What are its advantages to your chameleon vs. a 60 cent 60 watt GE household bulb ? Why did you buy it ? When it burns out, will you buy another just like it ? Thanks in advance.