I rarely find them in flashlights or other applications. It is either the smaller 20ma LEDs or the power LEDs. By medium power, I mean the ones around 100ma and are usually multi chip. Sure you can use a cluster of 5mm or a power LED (expensive), so why not a medium power LED?
What is the story with medium power LEDs?
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LukeA
Flashlight Enthusiast
They're less efficient than power LEDs.
2xTrinity
Flashlight Enthusiast
Medium power LEDs have not received a lot of attention from the manufacturers. Most that I know of are using dice that are MUCH less efficient, and in most cases with much poorer color quality than even the state of the art 5mm LEDs, let alone power LEDs.
These days I really only use power LEDs, even if I plan to dramatically underdrive them such as to use for a reading lamp. That's because only power LEDs come with decent color rendition and color temperatures (read: 5000k or lower, not "cat-pee" green).
These days I really only use power LEDs, even if I plan to dramatically underdrive them such as to use for a reading lamp. That's because only power LEDs come with decent color rendition and color temperatures (read: 5000k or lower, not "cat-pee" green).
lctorana
Flashlight Enthusiast
I bought some of what you would classify as medium-power last year.
They are 10mm package, rated at 25 lumens @ 150mA.
The thought of 25 lumens without requiring a heatsink struck me as very interesting indeed.
The possibility of a really cheap, all-plastic 3AAA LED torch has taken a step closer to reality.
It is the "Oatley Electronics 80000 mcd 10mm white" reviewed in the White LED Lumen Testing thread.
They are 10mm package, rated at 25 lumens @ 150mA.
The thought of 25 lumens without requiring a heatsink struck me as very interesting indeed.
The possibility of a really cheap, all-plastic 3AAA LED torch has taken a step closer to reality.
It is the "Oatley Electronics 80000 mcd 10mm white" reviewed in the White LED Lumen Testing thread.
tebore
Flashlight Enthusiast
The medium power LEDS would be the "spider" LEDs they were top of the line until the Luxeon change the face of the game forever.
The multi-die 5,8,10mm LEDs are kinda new. They aren't all that efficient. There's new SMJs in 8 and 10mm form using OSRAM dies that are pretty efficient.
The multi-die 5,8,10mm LEDs are kinda new. They aren't all that efficient. There's new SMJs in 8 and 10mm form using OSRAM dies that are pretty efficient.
