The last paragraph explains: > Unlike halogen and incandescent bulbs, however, LEDs release too little heat to activate thermocatalysts. So Kim's team is devel

The last paragraph explains: > Unlike halogen and incandescent bulbs, however, LEDs release too little heat to activate thermocatalysts. So Kim's team is developing photocatalysts that are stimulated by the near-UV light emitted by LEDs, as well as other catalysts that transform part of the LEDs' visible light output into heat.