djozz should be pronounced as if I were a really cool dj (there actually is a belgian dj who is not me but who calls himself djozz) , but my actual name is Jos which is pronounced close to “ioss”.
Errr…Ummmm. I’m still a bit confused. Are you saying the whole thing should be pronounced as one word that sounds like “ioss” The D would be nearly silent? For the “ioss” the “I” would lean toward having a “y” sound?
Thanks for doing this maukka. Looking forward to checking my current calibration (best guess with a zebra light).
Well at least there will be 20 or more BLF members with calibrated spheres now.
I have already seen that rated lumen’s is not the same as actual OTF lumen’s. I did a led swap in a Sunwayman V10R ti light yesterday.
I swapped out a Nichia 219c D240 for a AEDe 90 cri Samsung LD351D and gained 100 lumen’s with out changing anything else. I would have never known that before. Having it calibrated will make it even better for testing. Thanks again maukka. :+1:
OTF just seperates the raw led measurements from the led plus reflector, lens, driver, etc… losses.
Manufacturers ratings are OTF, but they are usually very “optimistic”.
I swapped the xpl out of an On The Road U18 and put in a sst40. It went from 690 to 845! I’m guessing it’s due to differences in forward voltage and overall efficiency.
BTW, the U18 is rated at 1090 lm even though it only draws 2.3A. :person_facepalming: It’s still bright, though. :+1: