My Dats are definately light sensitive, well, they used to be
.
Its taken 8 months for my DATS to stay stable with tank lights on. I used only a 2 foot flourescent tube for this time. Lights on timer and ONLY feed with lights on.
Now I occasionally turn on the 4 ft floures tube so I can see my tigers display in bright light conditions, ....the tigers have slowly adapted, so stay relatively stable even in this brighter light. Now say 8 months ago, as soon as the 4 ft light went on , my dats would go dark and lay on their sides.
In summer, when I dont always use the tank light as much, my tigers can look equally as good with natural room light levels.
Some peop have the patence to try diff stuff with dats. If u dont wanna wait, just keep reducing bulb wattage, until the right level of subdued lighting is achieved (for the dats)