http://youtu.be/Ym0P7Exk8MA LED into a light bulb requires the integration of some pretty sophisticated technologies.
- Components on the circuit board is often assembled by hand because its still too complicated for factory machines
- The actual LED wafer can cost as much as £5 a unit
- The brightest LEDs generate blue light. So in order to get the more natural white glow, manufacturers typically coat the bulb with yellow phosphor, an expensive rare earth metal compound imported from China
- LEDs additionally require the use of drivers to convert energy into electrical current. This component alone can cost up to £3
- Although LEDs burn cooler than Edison bulbs, they still need a conducting material to dissipate the heat. The aluminum used to accomplish this can cost as much as £2
Some newer technologies that bulb-makers are hope will help bring down the cost in due time, some of which include:
- Using larger wafers that would allow LEDs to be built.
- The production of green LEDs that when mixed with red and blue ones create white light.
- Smaller heat sinks that require less aluminum.