Best LUX light meter FOR FLASHLIGHTS?

[ipaulr]

What is the best and most accurate light meter for measuring our LED flashlights? Sekonics are known to be great but they don’t give a Lux measurement.

[Enderman]

Depends how much you want to spend.

[ipaulr]

Can you show me some options? I’m willing to spend.

[Enderman]

Djozz uses a calibrated MobiLux Class A luxmeter as reference for his tests

5 luxmeters compared (april 2018)

[image] The cause for this test was a 4-year old luxmeter comparison on TLF from member ' forest' (link) that I had never seen before and that was recently referred to on BLF. In that test, the noname orange-coloured LX1330B luxmeter (many people on BLF have one too) gave surprisingly good results in comparison to a high-end Gossen meter. Since I never had a look at that specific luxmeter, and that I needed a decent but not too expensive luxmeter for a new to be build integrating sphere, I b…

4 new luxmeters compared (sept 2018)

[image] I thought that after my test of 5 luxmeters in april 2018 I was done with luxmeter testing (not exactly a cheap pastime if you want to test anything else but very low-end meters), but then early this summer Enderman came with an unusual proposal: he would buy the Tasi 632A luxmeter that I tested in april this year off me for the new-price, so then for the money I could buy a couple of other new luxmeters that he found interesting, to be tested by me. In the end both he and I spent ev…

About $1.5k: https://www.lichtconsult.nl/product/mobilux/

[Bort]

A very low cost option is your cell phone.
CPU-Z can tell you what brightness the light sensor is reading. There may even be apps that can read and record numbers for you.

[jon_slider]

here is a turnkey solution for measuring flashlight output in lumens…

Texas_Ace BLF Calibrated Lumen tube / Sphere No math skills needed

the calculation of Lux has additional factors, that include distance, and illuminated area (beam shape):

for example:

both lights produce the same lumens, but the LUX are different because the light is spread over different size areas.

more info:
How to measure light in foot-candles, lumens and lux

and here is a Spectrometer
if you get interested in measuring Quality of light, in addition to Quantity of light.

[ipaulr]

Something relatively accurate and under say $300 would be good.

[jon_slider]

$175 – 3.5” version
contact Texas_Ace

[Enderman]

@ipaulr

Something relatively accurate and under say $300 would be good.

Look at the second link I posted, DJoz tested the Extech LT45 and it was pretty good.
Slightly over $300 though.

@jon_slider

$175 – 3.5” version
contact Texas_Ace

You do know that a luxmeter and an integrating sphere/ lumen tube are not the same thing, right?
OP is talking about a luxmeter. For measuring lux. Not lumens.

[Souichirou]

@Enderman

@jon_slider

$175 – 3.5” version
contact Texas_Ace

You do know that a luxmeter and an integrating sphere/ lumen tube are not the same thing, right?
OP is talking about a luxmeter. For measuring lux. Not lumens.

But the kit comes with a tested Lux meter which can be removed and can be used to measure both. So more value for the dollar.

[ChibiM]

If you want to do runtime graphs as well, you can have a look here:

https://budgetlightforum.com/t/-/56270

And if you like putting together some tools yourself, have a look at GChart's Lux Meter project: https://budgetlightforum.com/t/-/56270/55

I'm using 2 Extech SDL400 for runtime graphs. They are about $300. They can do both, runtime and just lux measurements.

If you want to go that route, I would suggest getting a sphere rather than a tube for more consistent readings.