OK. Let me explain it on a other way:
Click on this link:
TillyTec - ein einzigartiges Lampensystem - Lichtvergleiche TillyTec
You will see our light comparison. On the left site chose "LED 2000" from the Drop Down box. On the right site chose "LED 2000 Video" Now click on the middle button a few times. The pictures are changing. The picture with the darker light is the LED 2000 Video, the lighter one is the LED 2000. Both light heads are absolutely identical and both have 2700 lumen, but the LED 2000 got 4500 LUX and the LED 2000 Video only 3000 LUX.
Now you see why LUX is more important than Lumen because both got 2700 Lumen but 45000 LUX is even more then 3000 LUX. Both are absolutely identical light heads like I wrote before, but the LED 2000 Video got a angle of radiation of only 10 degrees whereas the LED 2000 got 110 degrees angle of radiation.
Now you see why lux is the truth and not lumen.
Our Backup 40W is the brightest and smallest with the longest burning time in the whole world. If you can find a backup light which is brighter and smaller which has a longer burning time than ours, you will get it for free! Good luck.