Is your result at turn on or 30 sec?
I get just above 2800 at turn on & 2770 after 30 sec
Texas_Ace BLF Calibrated Lumen tube / Sphere No math skills needed - Several spheres still available
Yes. All my results are at 30 seconds unless otherwise stated 
Hey Matt, have you used your new lumen tube to measure the gbx3590 GT you built? I think the led is rated for 3.6A (14,000 lumen), but the driver can only do 3.2A so it’s not being pushed hard. I’m curious what you measure. At least 10k lumen? Maybe 12k?
I did play around with it. IIRC it gave me right at 14k. This week and next I am doing a lot more serous testing that includes some descent climate control and as many other variables as I can squash so I will re-test that light as well in the batch.
WTF does this have to do with the thread?
Hey everyone! First of all, big shout-out to Texas Ace for building me another tube. I took some measurements of my lights (I don’t have Maukka’s calibration lights yet) and figured I’d post my results here too in case anyone was curious.
[Light]——[Emitter]—[Lm Turn-on/ Lm @ 30sec]—(battery used)
Acebeam EC65 Nichia- 1200 / 1100 (OEM) - I find this one very interesting
Armytek Viking XHP50- 1550/ 1450 (VTC5A)
Astrolux S41S 219C- 2100/ 1800 (VTC5A) 1600/ 1300 (KP IMR18350)
Emisar D4Ti SST-20 4000k- 2900/750 (VTC5A) 2200/ 1300 (KP IMR18350)
Emisar D4 SST-20 5000K- 3800/ 1800 (VTC5A) 18350TBD 2600/ 2240 (KP IMR18350)
Fireflies E07 Nichia 219B- 3100 -> 1500 @ 15sec (50E) 235 @ 7135 x3
Lumintop Prince CU- 880/ 855 (KP NCRB)
Massdrop Tool BR 219B- 70/ 70 (Duracell NiMH)
Massdrop Tool Ti 219C-87/ 69 (Duracell NiMH)
Olight S1R II Cu- 1084 / 1035 (OEM)
Olight S1R II Ti Autumn- 1078/ 941 (OEM)
Reylight Pineapple BR- 448/ 390 (KP 800mah)
Skylumen C8Fvn LH351D 4000k- 1950/ 1750 (VTC6) (VTC5A briefly had 2100lm turn on)
Skylumen D25Cvn Oslon White 1- 710/ 550 (E-fest IMR16340)
Sofirn Q8- 4300/ 4000 (30Q) (*cells not fully charged)
You don’t really need Maukka’s lights since yout tube was already calibrated. I guess it doesn’t hurt to have them, though.
Hi, I would like also to purchase one, 3.5”, paypal, ship to 97236. Thanks!
Oh, a neighbor has joined BLF - welcome.
Thanks for the welcome and hello to everyone! I am new to this forum stuff
I am currently building one for someone else, the parts should be in tomorrow for it. I am not 100% sure if I will have enough diffusers left to build another 3.5” after that but I think I will have just enough. I will contact you when this one is finished and let you know what I have left.
I just don’t want to oversell before I know for sure I can fulfill the order.
I should have enough for a few 4.5” left worst case since they didn’t sell as well and I have more parts left over for them.
Welcome to BLF Jobane, enjoy your stay!! . 
.
I got his made and after going through all the extra parts I found a few that had minor mistakes from the laser cutter that I didn’t use the first time around but should work just fine if I mix and match them to make them fit.
So I have the parts to build 1 more 3.5”sphere and a few 4.5” spheres.
I also suppose I could cut the 4.5” parts down to 3.5” if desired as well.
Emisar D18 5000k SST-20 with freshly charged Samsung 30Q batteries. 13500 OTF at turn on 10700 at 30 seconds. Large step downs from there 3000 lumens at 3 minutes.
Hello,
Hope it is not too late!
I would like to purchase one 3.5”
I have messaged you.
Thanks.
Thats about right… i got 14040 lumen @ turn on with my d18 sst20 6500k… i find sony vct5a solder blop make about 1000 more lumen than 30q.
I really need to get on this list for the 4.5” version, How can I
do that?
Howdy, The ground buy / list is over, I am now just making them 1 at a time from spare parts by ordering the missing parts as needed. Now to get one you just need to send me a message.
I am sending you a PM and we can sort it out there.
TA, sorry to bother, but since i am trying to build one myself, i am interested in the most important things which i have to take in mind to get a reliable setup.
I am using three white 90 degree pvc bends , use a glass lens inside the tube to have always the same distance to the luxmeter and i am using a frosted pvc piece inside the tube as a diffuser.
What other factors do i have to take in mind?
What about linearity ?
How to optimize the lumen tube to get a good setup?
Thank you in advance