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

Very interesting results.

Sure if DB wants to send me a light (possibly an S2+ or other cheap regulated light as well if he is mailing a box anyways for a wider sample) I am up for that. I would love to get some direct comparisons. I could forward them to Robo as well.

The lack of diffusers does mean there is a very high likely hood that the beam pattern will effect the readings. I know I could not get the readings to be consistent with different beam patterns (I used an LED with a bench power supply and different reflectors for testing) no matter how hard I tried until I added the diffusers.

Cool, thanks for that. I have been hesitant to push the benefits of the diffusers too much since I didn’t want to start a “sphere war” with people arguing over different designs.

Many designs work for what we are doing, I have simply found this to be the best in my own experience.

I will indeed add that to the op.

I like USPS… look like we are getting them on Monday… usps do great job and fast.

It also has to do with the size, larger packages tend to take longer. So an envelope is a bit easier to transport then a big hunk of PVC lol.

Also, I noticed in some pictures you posted that your sphere is still at a funny angle.

Were you not able to twist it any more? The PVC likes to get stuck, when this happens I wiggle it back and forth while pulling it out. The top piece has no glue so it should pop out.

Then line it up properly and press it back together firmly.

I got it fixed with the help of my brother… it’s straight… just did it last night…

pic upload

Great, much better and easier to use I am sure.

Got my correction disks today and installed the two disks per directions. Using my modified Convoy from PFlexPRO (sphere tested at 607 lumens), I get a reading much lower than I was expecting.

But here's where things get interesting. I reversed the correction disks in the direction they're not supposed to go (smooth side towards the sensor).

Now when I test the PFlexPro light, I'm only off by ONE LUMEN.

.

Again, with correction disks in wrong direction, here's the Nitecore TIP (rated at 150 lumens). And we get . . . 149 lumens. So, seems for my tube, reversed correction disks is what works.

Thanks for the result… pretty accurate… mine is on the way.

I got mine too… I tested the thrunite catapult v6 1700 lumen light and I got 1757 lumen… nice. No more math!!

Very interesting. What were the readings on both lights without the discs at all?

[quote] Very interesting. What were the readings on both lights without the discs at all? [/quote]

Let's see, from page 12 of this thread;

and from page 21 of this thread

Just making sure if I am installing it correctly… is this correct? Rough disc is not touching the sensor. Thanks

I just received three correction discs. The instruction says to use two. I just want to make sure for the 4”, I should use 2 also right?

Yes two… smooth disc is suppose to touch sensor right??

Good info Terry Oregon, thank you…… :+1:

If things seem off when I get mine, I’ll sure give this a try.

Thanks for looking that up. Very strange, it seems to be giving a lower correction factor then it should but it seems to be inline with the numbers I got with the old sheets in that orientation (around .64)

It is unlikely but possible that he managed to get 2 of the first batch of discs that read a little lower. In which case he is correct, flipping them around is what is needed to get the correct readings.

Yep, that is the correct way to install them physically, although I can’t tell which orientation they are. Both of the smooth sides should face towards the inside of the sphere with the new discs (which I made 100 of). With the old discs they were the other direction but there were only about a dozen of them mixed in, so it is unlikely that most of you have those.

Yep, I sent 3 to everyone (and 4 to the international people) just in case 1 broke in shipment. Easier and cheaper to send a spare then ship another package. I had the buy the whole sheet of diffuser anyways.

You only need to install 2 of them though.

I am not sure what you mean by smooth disc? There should be a smooth side and a rough side to each disc.

You want the smooth side to face towards the inside of the sphere for both discs in most cases (unless you got one of the first batch of discs).

this is what i’m experiencing with my kit.
With both smooth side facing the tube i’m getting a .64 correction. it seems a little low.
what seems to work for me is the smooth side touching, with that i’m getting a .675 correction.