at fullpower it is 40 watts, which would undoubtedly cook my snakes, it is only a fraction of that when maintaining temperature, this is basic, lights make light and heat, heating panel just makes heat, whats more efficient heating wise? If you want the direct relation it is 1 watt = 1 joule/sec. There is a reason i can unscrew a 13 watt cfl bulb or even a 80 watt HO florescent bulb with bare hands and not burn myself, but a 5 watt microwave incandescence bulb would burn my fingers. The less heat a bulb produces per watt, the more light it produces per watt. It's what makes LED so efficient for lighting, but not for heat, just about anything else would produce more heat with the same power.
Lets not make things up shall we?