[review] Wurkkos WK20 diving light [and for the WK20S as well]

[CLB]

@CLB

I plan to use both the WK20 and WK20S on a freediving trip to Catalina Island in September, and I will report back on how the lights performed underwater, and whether the tint problems of the WK20S were noticeable in actual use.

See Diving Light Comparison: SD05, WK20S, WK20