Texas_Ace BLF Calibrated Lumen tube / Sphere No math skills needed - Several spheres still available

BLF Special Edition Products
1155

Nice, I’m looking forward to your review and possibly buying some if you post any for sale.

1156

Yeah, I will have a handful for sale, just not sure how many yet or what they will look like.

1157

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.

1158

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.”

1159

Kind of depressing when you test those high lumen lights :person_facepalming:

1160

No wonder your convoy l6 is making over 8000 lumen… sigh.

1161

Who?

1162

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.

1163

Here is mine, set up exactly to the T/A diffuser disc instructions, using Maukka calibrated lights. Tube reads 58/278

Not too shabby!

1164

Thanks for the update KB!

1165

Thanks for sharing KawiBoy1428. That is excellent… :+1:

1166

Thanks Kawi. Excellent results… TA tube is the best !

1167

I got my Maukka lights a few days ago but just had time to test it on my 4” lumen sphere:
Convoy S2+ measures 318 lumens vs 274 lumens per Maukka = 16% too high
BLF 348 measures 44 lumens vs 38 lumens per Maukka = 15.8 % too high.

Please note that I only did a 0.70 calibration with the two correction disc instead of the recommended 0.68 because I was waiting for the Maukka lights to fine tune my sphere.

I’m once again disappointed to know that all my flashlights produces lumens so far less than advertised or from my previous measurements. I’m not disappointed at the TA lumen sphere though as it is such an easy fix having the Maukka lights in hand and the TA lumen sphere has been so very consistent compared to my calibrated ceiling bounce method. Thank you TA and Maukka for making it possible for us regular folks to be able to get accurate ANSI lumens for so little money!

1168

Maybe switch the disc and play around until you get lumen number close to maukka.

1169

yea easy fix as long as I have the Maukka light. I might even put a plastic bag over the sensor like what you did :smiley:

1170

Actually my Walmart bagged light sensor was not that far off. You can get lower readings by lengthening the bag an inch or two away from the sensor, or raise the readings by shortening the length from the sensor.

1171

You do whatever it works best for you… will you able to test the skylumen delta ?? You said you got 800 lumen… i would like to see what is it now after calibrated with makuua lights…

1172

I haven’t had the time to calibrate yet, but basically if I divide 800/1.16 = 690 lumens.

1173

For the S2+ I calculate you are 12% high, not 16%. Still, it’s higher than expected.

Any easy way to do the math is measure it without any calibration discs. Mine was 39% high, so when we subtract 32, I’m left with 7.

Geez, all these numbers are giving me a headache. :confounded:

1174

(318*0.98-274)/274=13.7