Maybe it’s not really important, but it might be nice in the interest of full disclosure to say in the OP that the “integrating pipe” is not your original idea. Others have been doing it for years. Although, I’ve not seen it done with diffuser material like you have. Thanks for offering this to the community!
Sadly no, even 4” PVC is not big enough for the GT and getting larger is very very expensive and somewhat hard to find locally. I considered stepping up to that size myself but it was just not worth 4x+ the price.
This can support up to a 3.5” (~89mm) light, which I find covers the vast majority of lights I want to measure. Thus far the GT is basically the only light I have had that would not fit, the TN42 would be just over as well but I don’t have one.
If someone wants a custom larger sphere setup with larger PVC I can do this, it will just cost much more.
Yes, the lumen tube is far from my idea, I never intended for it to sound like it was.
Making it an “integrating lumen tube” by adding the diffusing sheets and the centering rings to make the readings more consistent light to light was simply my evolution of the idea.
Out of curiosity for me and maybe others. How much would the lumen tube cost us for the bigger version to accommodate the blf gt? I don’t think this will be the last time companies will be making heads this large. I already have a few lights from acebeam and thrunite that are 4 inch. I believe olight and manker will also release some large head lights.
Hmm, that is a good question. I know the PVC itself was several times the price. If there is interest I will go to a specialty plumbing supply store and see how much it would cost.
Remind me to check into this if I forget, this week is going to be VERY busy for me.
It should be, you only need the very tip of the light sticking through the centering ring for it to work. In fact sticking the light in even 1/2” too far can have a pretty noticeable effect on the readings.