If you have the oil lamp in the grow room and the grow room is basically sectioned off, it will help them out a little bit (due to the CO2 exhaust). It's better then making one of those home made ones with sugar, water, and yeast. It will defintely save you some time and energy. I have read about many people doing this with oil lamps and kerosene heaters. As long as you know what you are doing, you should be good. Gotta love the old technology.