I think it is probably just a case of not seeing the light from the amber bulbs as well. I have used red bulbs in the past for a few different nocturnal geckos (as a heat source) and they were not active with those lights on. It definitely disrupted their day/night cycle if left on at night. A lot of my crested geckos do become active at sunset, so the amber bulbs probably simulate that for him.
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