LED: Difference between revisions
→LEDs in Flashlights
(→LED's in Flashlights: I'm fairly confident it should be LEDs not LED's) |
|||
| Line 17: | Line 17: | ||
==LEDs in Flashlights== | ==LEDs in Flashlights== | ||
Early LEDs did not give off that much light, but they were efficient and they would last many thousands of hours before burning out. As they got brighter, they started making their way into flashlights. The classic LEDs were 5mm in diameter encased in clear epoxy resin with a round head. As the LED inside gave off light, the rays were shaped by the round head to go straight ahead. Many keychain flashlights use a simple LED like that. These are usually named as 3 mm or 5 mm LED's. The [[Fenix]] E01 uses a 5mm Nichia LED. To get additional brightness, some flashlights would combine multiple | Early LEDs did not give off that much light, but they were efficient and they would last many thousands of hours before burning out. As they got brighter, they started making their way into flashlights. The classic LEDs were 5mm in diameter encased in clear epoxy resin with a round head. As the LED inside gave off light, the rays were shaped by the round head to go straight ahead. Many keychain flashlights use a simple LED like that. These are usually named as 3 mm or 5 mm LED's. The [[Fenix]] E01 uses a 5mm Nichia LED. To get additional brightness, some flashlights would combine multiple LEDs in the head of the flashlight and maybe include some kind of reflector to shape the light. | ||
[[File:sscp7led.jpg|thumb|Seoul Semiconductor P7 multi-die LED]]High power LED's were developed to handle higher currents and produce brighter light. They lost the clear plastic shell and had to be mounted to a metal base to draw heat away from the LED before it could burn itself out. Lumileds Luxeon I was a 1-watt LED producing 30 to 60 lumens and was followed by the 3-watt Luxeon III (60-90 lumens, requiring more power than the Luxeon I). They also produced the K2 which could be driven at even higher currents for more output. | [[File:sscp7led.jpg|thumb|Seoul Semiconductor P7 multi-die LED]]High power LED's were developed to handle higher currents and produce brighter light. They lost the clear plastic shell and had to be mounted to a metal base to draw heat away from the LED before it could burn itself out. Lumileds Luxeon I was a 1-watt LED producing 30 to 60 lumens and was followed by the 3-watt Luxeon III (60-90 lumens, requiring more power than the Luxeon I). They also produced the K2 which could be driven at even higher currents for more output. | ||