lighting for 50 gallon tank

[Eric]

Does anyone know of a chart or website that has a temperature log or something. What watt bulb should be in a 50 gallon tank?

[prism_wolf]

There are no charts. There are to many variables involved in finding the right wattage bulb for any setup.

What is the ambient temp in your home?
Is the tank near a window?
Is there an air vent near or under the tank?
Do you have a ceiling fan?
Is the top totally open or is there somewhat of cover? (even screen covers change the temp readings over a full open top)

The only way to find the proper one is to experiment. The nice thing about that is that if the bulb you choose is not warm enough...or it's to hot, you can always use them in your house fixtures...