How many lumens will this driver give me?

AlphaZen · Jul 13, 2010

http://www.shiningbeam.com/servlet/the-133/**NEW**-3-dsh-Mode-Regulated-Circuit/Detail

If I run this to an Xpg-r5, about how many lumens will each level provide? I understand heatsyncing and other variables will affect things, but I am looking for an approximation.

StackNZ · Jul 13, 2010

approx 435 lumens at 1.4A

AlphaZen · Jul 13, 2010

StackNZ said:
approx 435 lumens at 1.4A

Wow, that's a lot. Thanks. That would be emitter lumens? About 75-80% of that for OTF?

HarryN · Jul 13, 2010

I usually use OTF = 50% x rated LED lumens for applications like this.

AlphaZen · Jul 13, 2010

HarryN said:
I usually use OTF = 50% x rated LED lumens for applications like this.

Why only 50%?

John_Galt · Jul 13, 2010

He's probably assuming regular glass lens, heavily stippled OP reflector, and lumen loss due to the LED heating up...

AlphaZen · Jul 13, 2010

John_Galt said:
He's probably assuming regular glass lens, heavily stippled OP reflector, and lumen loss due to the LED heating up...

:thanks:

HarryN · Jul 19, 2010

I certainly do include the losses from the LED heating up, but also it is easy to under estimate just how much optical loss comes from slight imperfections in optics, even good ones.

Some of this also comes from the cold hearted measurements from using real light meters vs what is supposed to happen. Many people mistakenly are overly zealous with their flashlight's output. Sort of like fishing.

How many lumens will this driver give me?

AlphaZen

Enlightened

StackNZ

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AlphaZen

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HarryN

Flashlight Enthusiast

AlphaZen

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John_Galt

Flashlight Enthusiast

AlphaZen

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HarryN

Flashlight Enthusiast

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