Underwater Tourist
Contributor
I tried to spot the dimming, and yeah you can't easily catch it because it happens gradually. But if you keep a mental image of a part of a cave at the beginning of the dive and then compare it to what you see at the end of the dive, then its noticeable.That could easily just mean that their eyes adjust as it gradually dims and they just don't really notice that they actually cannot see as much of the cave or see it as well as they could at the start. But, it probably mostly means that, the way they use them, the light does not actually dim that much during a 3 or 4 hour dive.
Here is how much their 150000 lights dims; pretty much all of BBs drop a lot after 60 minutes. So they dim alot.
Just wanted to mention this point in the thread in case some new members haven't seen it before. The key implication is that when you are paying extra for supposedly higher lumen BB lights, your lumens will be gone pretty quickly, which brings the question what did you pay for?
you can click around for more lights, but the picture will be pretty much the same: We Test Lights | Bigblue Tests and Teviews