Jon_slider I ran the V11R test again in the lumen tube. The largest drift I get is 12 lumens turning the light at 500 lumens. At 8 lumens I got .2 lumens but that could have been partially from if the light moves in a different position in the lumen tube it reads slightly different. This was all tested after the light had become warm and stabilized.
When first turned on, on the high end of output a saw about a 100 lumen drift from cold start. Even in the lower end from a cold start the light will vary 30 to 40 lumens at about 100 lumen initial setting this is if I don’t even touch the light, just free standing on the first diffuser. But once the light becomes warm and I spin the light around about 180 degrees is when the largest drift occurs after warm. Turn it another 180 degrees and the drift goes back to where it was when I started. The most I saw turning it 360 degrees, was 12 lumens at 500 lumens.
I was curious about the larger drift from a cold start, so I did another test. I thought it might be the electronic components heating up on the driver causing the current to change and increasing lumens.
I turned on the light and let it warm up and stabilize in the tube. I can see when the lumen numbers become constant that way. I dialed in precisely 200 lumens and adjusted until it stabilized there. I then turned the light off and didn’t touch anything but the switch button, leaving it resting on the first diffuser for about 5 minutes to cool. Turned the light back on not touching anything but the switch. Out put started about 170 lumens and was climbing, after warm up guess where it settled at. Within .5 lumens of 200 lumens almost exactly where I had it set.