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Most forms of energy can easily be measured in watts and around 95% of the energy going in to your light bulb is being turned in to heat, so a 40 watt bulb is going to put out around 38 watts worth of heat, a 60 watt bulb is going to put out about 57 watts worth of heat and a 100 watt bulb is going to put out around 95 watts worth of heat.
Thing is, where is that heat going? doing something as simple as a chunk of foam between you tank and the outside wall can help alot, same with putting a chunk of space blanket under the tank or an insulated lid if you can still keep it vented so you don't kill them.
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