Also depends how high your basking spot is. The closer to the bulb the less wattage should be. When I used a 20L I used a 75. I took a floor lamp and put it next to the tank. Then I used a clamp lamp that could be slid up and down the on the lamp pole to adjust the temperature. I always believed in a digital temp guage with a separate probe (esu reptile makes one) to tell how high the light should be. I never had babies in the winter so I used a 75 in the spring/summer. The temperature of your house will change how high the light should be. You could also use a reostat or dimmer instead of moving the light. One big advantage of the floor light method is you don't have to move the light to slide the screen for feeding, cleaning, etc. Floor lamps are about $20 at Walmart etc.

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• What wattage bulb for 20 gallon - sclirada, Fri Dec 22 07:47:51 2006
• RE: What wattage bulb for 20 gallon - B22, Fri Dec 22 10:13:10 2006
• RE: What wattage bulb for 20 gallon - BDlvr, Fri Dec 22 11:11:44 2006
• RE: What wattage bulb for 20 gallon - sclirada, Fri Dec 22 14:00:45 2006
• RE: What wattage bulb for 20 gallon - jakentbc, Fri Dec 29 08:49:16 2006