Question converting Luminous Flux to Fluence

Novus · Jul 1, 2014

I want to achieve a 'fluence'/'power density' of about 50mW cm. I had a look at the data sheet for the XPE LEDs and the red LEDs have a luminous flux of about 50 lm at 350mA.

My question is: is there any way to convert luminous flux (lm) to fluence (mW cm(-2)?

AnAppleSnail · Jul 1, 2014

Novus said:
I want to achieve a 'fluence'/'power density' of about 50mW cm. I had a look at the data sheet for the XPE LEDs and the red LEDs have a luminous flux of about 50 lm at 350mA.

My question is: is there any way to convert luminous flux (lm) to fluence (mW cm(-2)?

Going by this paper...

The Cree outputs at 650nm instead of 625 nM. Let's use 625 nM = 200 lumens per optical watt, because it's close. You should replace this value though.

sr = Steradian, a cone of a certain angle. That is, if you shine a flashlight forwards, the cone of light shines out just like this.

Good luck!

Dr.Jones · Jul 16, 2014

Flux is about 100lm/W @ 650nm.
Luminous intensity for XP-E is about 16cd @ 50lm.
Irradiance E is radiant intensity I divided by the squared distance d.
So it's 16cd * 0.01W/lm / d^2 or 160mW / d^2,
e.g. 160mW / (20cm)^2 = 0.4 mW/cm^2 at 20cm distance.

Question converting Luminous Flux to Fluence

Novus

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AnAppleSnail

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Dr.Jones

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