Boaz is selling DC-Fix Here and he has mentioned that he has some other materials including some that are thicker/stiff that he needs someone to test. Maybe you could help him out with testing, and it might be similar to what you’re using for this tube or even the same material. I don’t know what price you paid for yours, but I think you should check with him.
Yeah, I got my DC-Fix from him myself. I was planning on using it for the sphere but it would of needed a separate piece of glass to mount it on.
The biggest reason I want more of this particular diffusing sheet is that stacked in the right order it gets the sphere within about 5-10% off the bat, which is much easier to fine tune then something that is further off.
I am pretty sure I saw another half sheet of this on a shelf when I got this but I didn’t worry about it since I didn’t think it would be needed. I plan to stop by tomorrow and see if it is still there.
What about using a 6 inch to 4 inch reducer on the regular lumen tube and then have a correction factor specifically for using that reducer?
That way it keeps the cost size and shipping weight down and only adds one extra piece to be used on rare occasions. The rest of the time you have the normal three and a half inch inlet and can read the lumens directly off the meter.
I have considered this as well but it would have to remain attached at all times, the calibration would change too much to be easily compensated for when it was added or removed I think.
Installing it on top would make it top heavy and I don’t think it would sit flat anymore.
Using a 6” to 3-4” 90* bend is another option I am thinking about but talk about expensive!
I will see what the specialty place has, if they don’t have it, then I don’t think I will be getting it.
Interested so put me on the list. Wouldn’t it be cheaper to just ship the diffusers and meter then we can get the pvc long radius streets and the reducer ourselves?
No, because they have to be assembled in a very particular way, then calibrated to TA’s meter (through “magic”) to give accurate results. Like he said before, even the orientation of the diffuser panels can alter the readings.
I am guessing that once he has finished construction and made all the final adjustments he will glue the pieces together to lock them into place. Perhaps with the exception of the 90 that the flashlight head goes into. He can mark the position that the 2 pieces need to be, then rotate the end 90° so it can be boxed up flat. When you get it, you rotate it back into position and be back at accurate readings.
That is my understanding of it.
Keep in mind that even different batches of pvc pipe from the same company can exist which might throw off the readings. The white pigment could differ slightly, the surface finish could differ slightly, etc… By TA doing it his way, he can compensate for all this.