Okay this light IS fussy about cells you put in it then.
I tried some 30Q (flat) and some VTC6 (flat) and both game a similar reading. In my non scientific bathroom ceiling bounce test I got
30Q - 106.1
30Q - 240.4 (with 2 magnets)
VTC6 - 105.8
VTC6 - 246.7 (with 2 magnets)
These numbers dont relate to anything like lumens or have any way of working something out but the light is MUCH brighter with the two magnets on each cell. You can actually see the light fire up on the lower mode very very very briefly then jump up to turbo. I can’t seem to capture it on video as it takes maybe 1/10th of a second but you can notice it as very quick ramping.
My initial impression of this light wasn’t that great. Now I can’t wait for it to get dark!