Yes, with your light regime one would expect a slower development of adult colouration. If you had a luxmeter, you would certainly find that there is no area in your tank which exceeds like 3000 Lux. Preferably you should have 20-100000 Lux at the basking spots. Thats why IMHO metal halides are a must for these -as for all heliophile- lizards. Add a 150 W metal halide (everything between 3000 and 5500 K is OK) and you will see the difference after a few weeks.
Keeping the lizards outside in summer will have the same benefit.
Did you buy these animals from me?
If so, they should in fact turn brilliant green.
If they stay dull, even under metal halide lights or outside, you may have aquired T. lepidus nevadensis or intergrades with blood from this subpsecies. These animals do show very little green. Even as adults they keep a greyish colouratuion but normally grow larger than the nominat subspecies.

Hope that helps

Ingo

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