WTS: Calibration lights for DIY integrating spheres / lumen tubes - 67 € -

Sphere is not needed for testing maximum lumens as long as you can measure a lower mode of the same light.

So for high power stuff you would just test the light on a low mode and then calculate the max based on some curve related to the expected diminished returns?

Relative brightness using two measurements outside the sphere I would guess or just heavily filter the sensor and take the same 2 readings to re-calibrate

I suspect something like measuring Low in the sphere. Let’s say it’s 953 lumen. Then do a ceiling bounce. Let’s say it measures 110 lux. That’s 8.66 lumen per lux. Then do the exact same ceiling bounce, except on Turbo. If we get 769 lux, then we can calculate the increase which comes to 6,662 lumen.

This makes sense in theory, but I’m not sure about in reality.

I did the same thing since I hat to measure a Olight X9R.
This flahlight has a sensor which lowers the output if something is too near to the reflector. With this I could not check the higher output-levels with my box. I checked lux in our toilette to calculate the lumen of the higher levels.
After that I made the same with my Imalent DX80, I found out that my box shows too low values on the higher output levels above 10,000 lumen.
Than I build a sphere and rechecked it with the Imalent MS12 and R90C. And there are some differences in higher levels too. Around 15,000 (R90C) or 20000 (MS12) there were some differences.

For the DX80 I rececked my lumen readings with the readings from spheres of other TLF/BLF members.

Three sets left and ready to go. Then I run out of lights and don’t know when I’m getting more.

SKV89’s and contactcr’s Jetusolis are here. Will test them as soon as possible.

!https://i.imgur.com/5k4kNiv.jpg !:https://i.imgur.com/5k4kNiv.jpg

Why everything you shot looks prettier? Even my handwriting looks better in there

- Clemence

My equipment is just too pro. Ikea LED bulbs and a 4 year old phone = magic.

Ah… not the usual Viltrox

Is there an available set still? If yes, I would like one

Just discovered this thread

Replied and shipped.

I’m running out of lights soon (two sets left), but ordered some more S2+ and BLF348. Also got ordered a couple of Convoy C8+ with 4000K CRI90 Nichia 219C. If someone wants check the integration properties of their sphere with a throwier light this could be a good option. It can also replace the BLF348 in a set.

Unfortunately with the C8+ the package will exceed the maximum thickness of 30mm for a small letter so the shipping costs will be a little higher. Around 7-16 € more depending on the buyer’s country. Also the light itself is pricier than the other two. That’s why I just got two for now. S2+ and C8+ together as a set would be 81-90 €.

PM sent.

One C8+ measured and ready to go. On its own, the price is 50 euros if you previously bought a set.

Well, I’m finally joining the calibrated-meter club. Pretty soon, people should be able to expect much more accurate measurements from me.

Nice, are you building your own integrating sphere?

/\…. :beer:

No, Dale took pity on me and is sending a nice calibrated lumen tube. It’ll put my “integrating milk carton” to shame, and eliminate the need to use my other device, the “integrating bathroom”. I also finally ordered some calibration lights to go with it, which might be here by the end of the month.

So… I’m basically joining the club because I got a kick in the pants. But, like, in a nice way. :slight_smile:

TK :smiley: :+1:

Dale as in DB Custom or do you mean Texas_Ace?