I know how you feel. I used to think my extensively “calibrated” ceiling bounce method was spot on. Then with the TA tube, I realize how far off ceiling bounce method is and how ceiling bounce grossly favors throw beams over flood beams. Then I thought my TA tube with the calibration discs applied were reading spot-on until recently after I got the Maukka calibration light kit, I realize my TA tube was reading 16% too high. It’s a shocker and disappointing to know all of my lights perform so much less that I used to believe.
I highly recommend anyone with a non certified lumen sphere to buy the Maukka calibration lights.
I’ve made a light box but tbh no matter how I measure the ROT66 it tests far higher than all my 5 Emisar D4’s and D4S. It looks far brighter. Wonder if Maukka has a duffer.
I have the XP-L HI D4S, it hits 4600 lumens in my lightbox. I think Newlumen got a similar figure to give a little indication of where it should approx be hitting. In a straight up ceiling bounce my ROT66 Nichia destroys it and tbh the D4S has a thrower advantage.
Maukka measured his ROT66 in 28c, I measured mine in half that, and tbh his sphere temps may have been soaring if he’d checked calibration with similar powered lights before hand, after 30/60 seconds my ROT66 was reading no where near the surace temps Maukka’s was. He got 50c after 30 secs, mine was 40c!
Newlumen has the 4” TA lumen tube which is the same as mine. Our numbers used to match reasonably well until I received the Maukka calibration light, which is when I realized my TA lumen tube was reading 16% too high. Newlumen has a set of the Maukka lights on order and we will find out soon.
Steel_1024 measured 4,880 lumens with his TA Lumen Tube but not sure if he has a set of the Maukka calibration lights to confirm with. The TA Lumen tubes that weren’t calibrated with the Maukka lights were reading too high.
Charles Lin measured 4,740 turn on lumens and 4,300 at 30s with the TA Lumen Tube. But it might be his TA Tube also does not have correct calibration and reading too high.
I’m not saying your measured 5,700 lumens with the ROT66 219B is certainly incorrect. Just saying there’s a good chance and the only way to confirm the accuracy is to get a set of the calibration lights. It’s very affordable anyways.
My Nichia Rot66 just came in yesterday so I can add some numbers to this:
Turn-on: 4520 lumens
30 seconds: 4050 lumens
That’s taken in a TA tube that’s been calibrated using a set of Maukka’s lights, and generally jives with the other numbers given here which seem to range from ~4300-4800. Except for your reading of 5700 lumens, which would mean that yours is ~26% brighter than mine. Almost two entire flux bins higher. I hate to use the word “impossible” but….
Got my ROT66 with Nichia’s, really nice!
Output at switch-on (it takes 3 seconds before the first read-out): 4300 lm, at 30 seconds 4000 lm. This was on freshly charged 30Q’s.
I do not have a stock D4 left (I do have a pretty :sunglasses:
one with LuxeonV’s though ), but I trust my ROT66 measurements to be correct within the 5% that I stated above.