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Starting at around 6:10 Matt is using the TA Lumen Tube. He places the lights directly on what appears to be the first set of diffusers. Is this the “proper proceedure”?? From what I remember reading it is not.
But my question is this. If the light is placed on the first set of diffusers and the tube is then calibrated using maukka’s calibration lights , will the tube yeild the correct readings?
Got my Maukka calibrated and tested lights in today.
cw S2+ — 283.3 Maukka lumens — 288 TA Tube lumens
So that’s less than 2% out. That’s fantastic really, I don’t know how you’d expect much better.
The package also contains a tested BLF348, neutral white and only a few dozen lumens, but it reads a bit further out so far. I’ve not recharged the cell though, so I’m withholding those numbers until I’ve eliminated any other cause for them to be low. Its not fair to report them at this point.
So far though I’m very pleased with these results.
The above comments are correct. That tube is one a made a good while back. The readings I got for that light should be quite close, but the testing you saw in the video is basically the only testing I have done since my Maukka lights arrived, so don’t take it as absolute truth :innocent:
Actually they showed up a little bit ago but I have not had time to mess with them yet. I am hoping to get some time next week to test them out if all goes well.
I got my CW S2+ calibration light from Maukka yesterday.
It turns out my TA Lumen Tube was one of those outliers. It was reading 7% too high.
So I was able to adjust my correction disc orientation plus add a little piece of matte tape to get it to read dead on. :+1:
I also tested my calibration light in my JoshK sphere to find out it was reading 6.3% too high.
This is all pretty surprising. I thought both my spheres measuring so close to one another meant they were pretty close to accurate. Turns out they were both a little on the high side.
Yep, welcome to the world of DIY calibration. This does not surprise me honestly, this is why I said that with the afer-market correction discs 7% was my tolerance of choice since that was the highest I saw just dropping the discs in.
Like Djozz said, “The man with only one watch always knows what time it is.”
If you want to get your sphere re-calibrated I can loan you one of my standard lights to fine tune the calibration. Since the first ones were not directly calibrated with the standard lights, they will have a larger tolerance of course since the correction discs themselves can have a few percent of variation.
