Wow, that is a ton of work! Thanks for the effort, very useful.
That XM-L2 U4 is a nice surprise! At only 4.73A it beats the U3 at 5.15A with flying colours. I hope it is not just a lucky emitter and that they all perform so well.
And I have been proven wrong here on the red XP-E2 throw: the throw does improve after dedoming.
The XM-L2 U4 has a similar percentage change after dedoming compared to the U3 and the amperage is basically the same between dome/dedome between the two U4 emitters.
I think the spread of numbers of the LED’s looks right on, however I’m wondering if your meter reads high on the lux measurements. They all seem about 15% high compared to what I would expect.
Does anyone else agree? Maybe it’s not that your meter reads high, maybe mine reads low.
I don’t know. I plan on doing a couple more tests today with the 1503 and 1505. I have another meter but it’s a cheapie. Between the two I trust the one I used more. These measurements were taken in my garage with the door closed and no other light. A tape measure was laid out on a table, the light placed on a rifle shooting bag, and I mounted the Lux Meter at 6 feet with a timer. I adjusted the light for the highest output and at 30 seconds (some later than that) I recorded the highest number. The XP-G2 S4 I actually repeated a second time after it cooled and got 136300 lux so pretty damn close to my first one. Let me know if you think I can do anything different.
Oh, no, I trust your efforts. The numbers just seem high compared to the measurements I get. It’s entirely likely that we’re just measuring with meters that are off a bit in opposite directions.
One thing to try just to make sure, remeasure one of the lights at 20+ feet and see if the numbers change much. With most zoomies it doesn’t make much of a difference with my meter after 15’, but I’ve had weird readings sometimes if too close.
You interested in us putting together two identical lights, measuring them, and then shipping to each other to test the differences between our meters? I think I have a spare 1504 host around here somewhere…. :bigsmile:
Thanks so much for the very thorough testing’s n10sviern
It confirms my initial train of thought that the xml2 U4 wouldnt be far behind the xpg2 s4 in terms of throw. As well as the relationship between lower current draw with the newer emitters and higher output, obviously pertaining to higher vf.
Since you’ve done so many hot dedomes, what sort of temperature and amperage range would you say is ideal to dedome xml’s and xpg’s?
It’s possible, but the light is about 8” above the table. Over 6 feet, it seems it would be minimal. I’m gonna try something new. I’m going to place the meter on the floor and hang the light 6’ high. It’ll be easier to adjust the meter.
It is a emitter lottery, lens lottery and luxmeter lottery. I'm surprised that the numbers from different people are generally so close to each other :-)
The 1503 was about 40% of the throw of the 1504 on both the XM-L2 and XP-G2. One was like 39.5% and the other 40.5%. Regardless, I think this consistency confirms my 1504 readings a little. As for the 1505, it didn’t like the XP-G2. I check my measurements two different times and got the same 34100 lux. Due to this, the XM-L2 U4 wins with the 1505.