Your picture said it all.
You have a veiled, they like a little more UV than some species.
You have a good amount of distance under the bulb, at least 10".
You should be ok with a 10.0 linear bulb.
Chameleon wars? Whatever. You've never seen a full grown bull Parson go on display after seeing a dinky little panther fire up on him. I never knew a big chameleon could be even bigger. That panther hauled ass , and in typical Parson fashion, the Parson didn't bother to move afterwards.