How many DIY types on here have your own light meter?

Just curious as to how many of you have a light meter?

I'd like one but so far have not felt like spending the money for something that I can't change regardless of the reading.

I could to a degree I suppose and that's why I may get one at some point but since I don't have any real soldering skills I can't affect lux by changing the driver to one driven harder. I could experiment with varies aspherics and that's the only reason I would buy one.

If someone else experiments with asperics and has a light meter I'd like to hear from them as we may have similar lights and I could get some feedback from them since they would have measured their lights.

In any event I'm curious as to how many of you have one and how useful you have or have not found it to be.


Not yet!

Is there anyone who has a light meter that has measured the lux for an XR-E R2 me with a 28 mm aspheric? What did it measure and how hard was it driven?

I think I could roughly figure out my aspheric lights with that info.

The lights I'm wondering about are three:

38 mm aspheric using XR-E R2 at 750 mA.

34 mm aspheric using XR-E R2 at 650 mA

19 mm aspheric using XR-E Q5 at 650 mA

I have one. Actually two: one from DX and one more expensive one in the lab.

Every flashlight I get or mod gets measured (ceiling bounce, spot intensity, as well as current, modes, diameter etc.; my integrating sphere is still not finished), some other things get calculated from that (e.g. NEMA-throw, throw/diameter etc.) and noted in a calc table. I'm a physicist, I like to measure things :) I used to publish the results on my web page, but my server is broken currently, I need to get and setup a new one.

Bro, is yours this one?

I have this one, how much deviation is this compared to your lab one? General concensus is that it under reads.

I am aiming for a CEM DT-1309 with data logging via USB.

Nice, but too expensive.


I dont have one "yet". I do however own a laser power meter lol.

I have some:

The AEMC is supposed to have the best filtering of the economic lux meters and I use it for everything where I manually measure lux.

The HD450 has a stand alone logging function and is good for runtime measurements (But the logging has some problems).

The Tecpel is just a cheap meter, but has analog output, i.e. I can use it on my test bench for logging on a computer, together with a couple of computer connected DMMs. This gives this kind of graphs:

I have one and use it all the time in my integrating sphere(Match design). It is very useful. I.S. is finally done

Thanks for that link. At that price from Amazon knowing I'll get it quickly I'm going to order that one.

2100: No, I got the 20000 lux version.

With daylight, their readings are within 2%, but I didn't check with LEDs yet.

I have a Meterman light meter from 2004.