From the sounds of it, you need a lot more light to keep any plant alive. Pothos is about the least light demanding house plant and if it's not getting enough light there's really no other option.
There are a variety of lighting options, but one of the simplest and cheapest is to use a few higher wattage PC bulbs in dome reflectors in close proximity to the plants. You can get daylight, ~6500 K bulbs at any home improvement store, along with clamp lamps. You specifically want bulbs of this spectrum as it will be adequate for the plants. Most other available bulbs (e.g., 'cool white') hae a much less useful spectrum, and hence provide less useable light to the plants. Two to three bulbs and clamp lamps should run you under $50.
I also think that we generally underestimate (or outright ignore) the effects of too little or poor spectrum light on chameleons. Animals kept in dim conditions without much full spectrum light (above and beyond access to UV-A and UV-B) often have poorer coloration, and sometimes reduced apetites and activity IME. Light quality and quantity in the visible spectrum have known, important psychological effects on many animals and I think it's very likely that this is true for chameleons as well.
Are the leaves/stems sturdy? I don't my guy falling everywhere 
he is not the brightest cham, tries to climb up the walls and junk all the time.
