Hello, im a veiled owner and I have him around 6 months and i had him during the summer time. Now I live in Easter part of Croatia where summers are extremly hot (35°C) and winters extremly cold (-20C°). Now in summer in terrarium it was around 25 26 C, and now the winter is coming and its around 20 suddenly! I have always used 50W bulb should I buy him 75w? I know i should but theese are rearly used so i want to be sure.