I purchased an incandescent light bulb today 75 watt for my frogs because my black light burned out and I figured since its getting cold I can use this for nocturnal viewing; so I turned it in tonight and let it go for about two hours (8-10) and when k came back up they were both still sleeping so I shut the light off to see if they were just being lazy and the oldest finally woke up and hopped around shortly followed by the other one. So should I keep it on so that they realize that they get used to it or Leave them be without a light and not be able to see them ):