Incandescent bulbs produce 10% light and 90% heat. Fluorescent are better, 50% light and 50% heat. LED however is 90% light, 10% heat. Thats 9x more efficient. When you flick the switch, are you heating your home or lighting your home?

LEDs:

- produce no infra-red or UV radiation

- don't flicker like fluorescent (major cause of migraines)

- are instant on (don't warm up like fluorescent)

- are immune to vibration (major cause of other bulbs blowing)

- produce much less heat (main cause of other bulbs blowing)

- are directional by default (no inefficient reflectors needed)

- last up to 50,000 hours (20x longer)

- can switch on/off without damage (other bulbs don't like it)

- compact size (can go in places bigger lights can't)

- can choose color tone

- can change color

- can be dimmed (fluorescent can't)

- fully recycleable

- no dangerous chemicals (like cancer-causing mercury and phospher in fluorescent)

- low running cost

- low carbon footprint

- ultra-reliable (think about security lights blowing)

- more vandal resistant than fluorescent or filament bulbs

- solid state

- lower maintenance costs (less work for electrician changing bulbs)

- no burn danger (halogens can give 2nd degree burns)

- kid safe

- far less risk of house fires (halogen is #1 cause)

- energy saver bulbs are ugly

- solar ready

- better thermal integrity for ceilings