Hi, I am the_holodoc from TLF,
I have got my light yesterday and posted a bit about it over at the TLF: Sofirn C01R, 1xAAA Rotlicht, 660 nm | Taschenlampen Forum
I will try to repost an English version of this over here, so that you can see the pictures as well. I am sorry if this post is a little rough on the edges, it’s my first post over here.
This is the packaging content:
Among 1xAAA colleagues: from left to right: Olight i3E EOS, Sofirn C01R, Olight i3UV EOS
Comparison of beamcolor: left: Sunwayman C21C, right: Sofirn C01R
Brightness comparison: left: Olight i3E EOS, right: Sofirn C01R on on its highest level
Brightness comparison: Zebralight SC600 with some diffusion on its 0.2 Lumen level, right: Sofirn C01R on its lowest level
Beamprofile:
Bounced flash:
Sofirn C01R:
Current measurements:
AAA white Eneloop (800 mAh), charged to 1.45 V and Multimeter (Mastech MS8268) with just the original cables and tips. At high currents some deviations due to contacts resistances adding up are to be expected, so take my result for the highest level with a grain of salt!
Low mode: 15 mA
Medium mode: 105 mA
High mode: 2.5-2.8 A
Today I improvised a little to obtain a brightness-runtime-graph for the highest mode.
I used the following setup: The light is surrounded on five sides with A4 sheets of white paper, it is tailstanding to light up the white “ceiling”. Next to it I put my smartphone (Pocophone F1) using the App “Physics Toolbox Sensor Suite” (mode: light metering, digital display, I recorded the data during the measurement, but I ended up not using these records), the automatic switch-off of the display was disabled.
I photographed this setup with my Olympus OM-D EM5II using the built-in Intervallometer every twelve seconds with fixed exposure settings (ISO 200, F/5.6, 0.5 s).
Setup without the light with room lights switched on:
Setup at work: roomlight is off, reading of remaining ambient brightness is 0 Lux
The Sofirn C01R was equipped with a white Eneloop (1xAAA, 800mAh, 10 years old). The Eneloop was charged fully half an hour before the measurement. Right before the measurement it had a resting voltage of 1.47 V. After the run the hot cell had 1.12 V. After letting the cel cool down I charged it with my Miboxer C4 V3 which showed, that it had charged 720 mAh.
Overview of every third image with each also showing the time when it was recorded:
The resulting brightness-runtime graph (readings from the images, sthe steps apparently stem from a low measurement resolution of the phone):
After a little over 15 minutes the light switched down to its lowest mode, which ended the measurement. The light was pretty toasty afterwards.
The readings for the current draw on the highest mode where apparently not that far off. It drains over 2 A from the cell to deliver that much power to the LED. On the highest mode it’s a nice little red dragster and on the lowest mode it is a sensible choice for preserving the eyes dark adaptation.
I had expected a bigger visual difference between the Sunwayman C21C red (most likely around 625-630 nm) and the Sofirn C01R with it’s 660 nm emitter.
During a round of urban astrophotography last night the lowest mode proved to be not to bright although it could be a little lower for that purpose. I guess I will have to get one more C01R for a colleague of mine…
Resume: I like what came out of this project! Good job to all contributors!
Kind regards
Frederick
