The effect of all our waste heat on earth's climate is insignificant -- thousandths of a degree. The greenhouse effect works in a completely different way, by CO2 reflecting infrared radiation that would otherwise transfer heat from the surface into space.

It's dangerous to promote incorrect ideas about how global warming works. For example, if global warming was just a problem of waste heat, we could shut everything off and things would be back to normal in a few days. But because it's caused by CO2 accumulating in the atmosphere, once we release CO2 it takes a long time (hundreds of years) for it to be re-absorbed by forests. People who saw these light-bulbs in a box might think that a quick solution is possible if warming gets out of hand.