Did you shine it through the wall on the opposite side of the hole?
I tried what you said with my DBC-03 and got 1052 on the meter, x10, 10520 x .238 = 2503.76. The only problem with that is my other light box reads over 4000 lumens.
Using the app, I put in 1246 through hole on level 2, 22 through wall on level 2 and then 10520 through wall for 3006 lumens.
My PVC trap says 4440.15 even coming last after the other testing.
Edit: FWIW, this one fits in the hole.
I think part of the problem is that as the head size changes, so does the multiplier. To be clear, I have no experience with these, but reading this thread left me with this feeling. In order to test the theory, use a couple lights that have different head sizes that DO fit in the existing hole. Take the readings as Joshk describes in his tutorial video, then see if the magic multiplier number is in the same ballpark as your .238 that you have already come up with.
lol
Hmmm… That’s more than quite a few lumens off. I think you should try my method again with maybe some more known value lights. U have any stock lights? Or maybe even try something with less lumens. Like something easy. Something with only a single emitter. This way we know what the max that single emitter can do.
Oh, and I shined the light to the left of the hole…. On the same side as the opening. The meter and bracket is on the right side
Hmmm... I wonder is it possible to get an accurate reading(with doing all the math of course) just with a one inch thick piece of styrofoam? Flashlight on one side sensor on the other?
blueb8llz, pretty sure Josh said to use the opposite side for through wall to make use of the baffles internally. The video shows spinning the ball around so the meter is physically on the opposite side in the box, then shining the light on the middle of the ball exactly opposite the plugged hole.
Perhaps if you try it that way, your .238 number will change.
Edit: Since a multiplier of .422 equals my other method of testing, I will try a few other lights to see how it compares. Stock? Huh? What’s that? 
Ok just discovered something weird, and this proves why u got that low number Dale.
I get the same low number only when using lights with those type of cute or similar optics.
I tried four different lights with those optics. Ranging from triple xpg2 and xml2.
This is odd. Something to with these no reflector optic lights causing a low lumen rating through styrophone.
No, that won’t work because the meter has a rounded half ball for the reading, and the back to a flat piece of styrophone is flat.
Yea I experienced the same thing. The reflector definitely causes a higher percentage of light to penetrate. Without the reflector the light that bounces off the white foam the first time never gets a second chance. A good reflector gives it a second, third, fourth chance to penetrate.
This is a good group conversion, I’m going to sit back and watch for a while 
So any TIR Optic would do the same thing then, like a big 50mm TIR I have in a MagLite?
I believe so. I just found two more lights with these type of optics, a total of five lights now, and they all gave lower readings.
My biggest light with this type of optics is a lumintop ps03.
And I tried redoing the test but this time shining the light on the opposite end of the sphere and got the same reading.
The sphere does a good job trapping all the light. I even shined the light right next to the meter, and still got the same number.
The only place that DOES change the number is if you shined on the crack where the two halves meet together to form the sphere. I’m assuming there’s a super tiny crack and it’s literally right across from the meter.
You guys have all the fun. :innocent:
I’m still waiting for delivery of my sphere …
I can probably locate your tracking number if you need it. You are in Hawaii, so this is probably normal. I recall for a fact that your box was the second one handed across the counter at the post office.
I received my sphere earlier this week. I have only just started messing with it, but I like it! Just need to get the hang of using it. And, I don’t have many stock lights, and even less with what I would consider reliable ratings, so there will be a learning curve.
In regards to optics not pushing the light through the wall for high lumen, multi LED lights with optic measurements. Most of the lights I have fit in to this category. I am a lighting technician in theater, and I have access to all kinds of lighting filters. This weekend, I will take some neutral density light filters home to experiment. It is a grey gel with a known translucence. I am going to try 50% and 25% to see if I might be able to measure them through hole. I can also add them together for even less translucence.
We’ll just see how it works…
Thanks again Josh for doing this!
I just PM’d 1dash1 his tracking number. If anyone else is still waiting on delivery, please let me know asap. I am cleaning off my desk and these receipts are getting thrown away.
Hi, I didn’t see this thread until now. Am I too late to put in an order?
I have one of the surplus left. Posts 413 and 414 explain how the situation started and why I decided to offer the following… If you want (that one) immediately, I am asking $126 for shipping today. For anyone willing to wait for the next batch, just ask to be on the list and those will be $106. It will take a month to get supplies AFTER the list ends. And for anyone that wants to build their own, I am going to fully video document the next batch I make. And I will upload all my 3D printing files too. There’s a post somewhere in the 300’s or 400’s detailing my latest costs, basically it’s not profitable for me, but that’s ok, it was more an engineering hobby project for me. I really enjoy designing things.
I think we should all chip in a few bucks and pay for Toykeepers with all the invaluable work she has done here that most of us have gained from.
Start the thread :sunglasses: Count me in for $15
This is my busy season for work and I’ve been slammed. Plus I’ve been working on 4 vehicles- 2 of mine and 2 for family, all of which has left me with no time to play but tomorrow night looks good so far.
Phil
Done. New thread started.
“Toykeeper Appreciation Gift _ BLF Integrating Light Sphere” - Toykeeper Appreciation Gift _ Hardware Upgrades
EDIT: TK indicated that she would prefer some hardware that she could experiment with to expand the boundaries of what we are able to do with flashlights. She thought that was the best way to spend the money, to benefit the BLF community. So, we won’t be buying a light sphere for her.