Hi Dawn,
It really would be better to have a dimming thermostat control a bright light basking bulb. The on/off cycle isnt very natural for them. And ideally you should use a heat bulb that also produces light.
So I'd recommend switching to a basking bulb that also produces light, and either getting a dimming thermostat, or not using a thermostat at all and just finding a wattage that works for you.
Are you worried about anything else in regards to them or is it mainly the color. Because like I said, to me there colors look fine
I might have missed it but how long have you had them now? If only recently, even older dragons can go through relocation stress.
It might be a good idea to weigh them so you can track it and make sure they aren't losing too much weight.
Will they eat at all for you?
-Brandon