Larger LEDs?

[Sesoku]

Is is possible to increase the light output of a LED by making them larger in size?

 

[Lux Luthor]

See the thread from Cyclops942 on the 2nd page of posts. He asked this recently.

 

[Cyclops942]

Click here for a direct link to that thread.

 

[NightShift]

Cant they just make a couple of diodes in one LED fixture to increase the light output? The thing seems small enough to fit more than one in there.

 

[Chris M.]

There are superbright LEDs with more than one diode chip inside, although larger than normal size. Trouble is you get the same problem as trying to focus a cluster of LEDs with a flashlight lens- the light comes from many individual points inside but is all focussed through just one lens so the result is a bit odd. See the first LED of this bit of Craig`s LED site...

<center> http://ledmuseum.home.att.net/ledred.htm </center>
I don`t know how much these cost from Roithner Laserteknik but it`s probably a lot (might say on their web site?), and since the LED dies inside are series connected they will want quite a high voltage (over 12 I`d say )to get them to work, so these are probably not that good for a flashlight. I don`t know what other colours you can get either besides a slightly frightening IR one, probably not white though.
Ideally you want just one die at the focal point of the lens and the new Philips/Agilent ones do have a larger die inside than normal (eg Nichia) LEDs so I`ve been told.