Excellent writeup, thanks for digging that up. This is an interesting comparison, as these two seem to be the leading contendors for bright LED primary lights in this price range (sub $120 or so). Unless anyone else know of another?? The one big flaw with the flashlight review writeup, is that he ran both lights out of the water. UK acknowledges a large difference in performance because of their heatsinking, so this does make it difficult to compare. But regardless, here's the simplistic #s as I'm reading them:
UK C8 eLED Plus: Throw=43.47 Output=80 @ 100%
Princeton Tec Shockwave LED: Throw=50.99 Output=120 @ 100%
One number can draw from these measurements, is that the Shockwave has a 17% wider throw. Using their posted formula for a rough approximation of Lumens (multiply output by 1.39), we have:
UK: 111 lumens, Princeton: 169 lumens
If you look at the discharge curve, the UK quickly diminishes to about 80% output (again, air cooled! underwater should be significantly higher), and maintains roughly 80% until it dies at 4:30. 80% of 111 lumens, is about 88 lumens sustained.
The Princeton Shockwave LED, with no regulation, quickly drops to about 60% output, and then slowly creeps down from there. Averaging it over the same 4:30 hours as the UK, we get roughly 55% of total output for 4:30, which is 93 Lumens.
I guess the big question is, exactly how much does the underwater cooling effect increase the output of the UK?
Rob
) so I'm debating picking up one of these...
