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

BLF Special Edition Products
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If anyone else is interested in the Optisolis/E21A powered Jetbeams Clemence with calibration data, let me know. No schedule is set yet so be patient.

Disclaimer: I’m not sure these will make for a better calibration if you mostly want to test low CRI lights with lux meters, but the smooth spectrum of the Optisolis would be a great reference for future.

Just like with the S2+ and BLF348 or any other light, price for measurement is 15 euros per light plus intl shipping (4.70 or 7.50 euros depending on weight). Does not include the price of the light itself.

Interest list:

  1. SKV89
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Three more original calibration sets (BLF348 & S2+) ready to go immediately.

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Two torches arrived today thank you very much maukka. Now to find time to play. :slight_smile:

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Great, that was quite a bit faster than I expected to Australia :+1:

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18 days total time for delivery over Xmas is not bad at all. Thanks again. :+1:

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the Jetusolis orders are starting. Can I make arrangement with clemence to get one shipped directly to you?

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Hello Maukka,

I’m interested in the flashlights. Are they still available? PM me if they are. Thank you.

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Maukka, what is the largest diameter light you are able to test? Also what would be the upper limit in lumens?

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The input port is 100mm in diameter. No upper limit in lumens.

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Two sets still left.

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From Lisun:
The IS-0.5M (19.685 inch) is suitable for LEDs, LED modules, High Power LED, mini bulbs and other small lamps. The flux testing range is 0.001 to 1,999 lumen.

I believe Maukka uses a neutral density filter over the sensor to allow for much higher outputs than the rated 2,000 lumen. These filters seem to give a very consistent reduction in lumens.

Surely there must be a lumen limit, but who knows what it is.

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

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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?

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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

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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.

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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.

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

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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

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

- Clemence

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