Hi, I have just up sized Frankie's viv he was in a 3ft X 18inch X 18inch now he is in a 4ft X 2ft X 2ft the bulb I had was ceramic 100watt for night time and 100 day bulb. I'm having to leave both on at the moment to get right temps. What watt day bulb do I need to hear her viv I was thinking 150watt but don't want to get the wrong one. Many thanks