I have tried to replace old bulbs with leds, the bulbs just don't last long enough to pay for themselves. It's not the LEDs, its the transformer within the bulb. Two different transformation of voltages are going on, generating a lot of heat by itself. What we need are transformers that take care of the entire room, letting the diodes operate at their preferred voltages. Put the transformer in the wall, built into the switch. Nothing but leds in the bulbs and then they will last for years.