I have seen this debated ad nauseum on various boating forums the last few years. No problem using them while underway on Lake Murray in SC. Nearly every modern pontoon on my lake runs them at night. And I boat as much at night as during daylight. I even had the chief DNR officer on my lake look at my lights in person and he gave me the go-ahead. In SC, flashing blue lights are reserved, by law, for law enforcement. SC code of laws does not say anything about solid blue lights.
I'm nearly positive Coast Guard regulations that many people quote apply to navigable waters. An inland lake with no outlet to the sea is not considered "navigable water." Lake Murray near Columbia, SC is an inland lake so Coast Guard regs do not apply to my lake. (I realize local laws may be identical to the Coast Guard regs and would apply in those locations.)
I run 16 foot blue LED strips down the side of my 22 foot plus tubes and they stop a few feet from the nav lights so my nav lights are clearly visible. I don't believe my lights night blind someone because no part of the LED is visible. You only see a beautiful cobalt blue glow off the toons and water. I can see where they would night blind someone in close quarters, so I turn them off in those situations.
I decided to mount LED's after an experience watching fireworks on Independence Day several years ago. Our lake gets so crowded that night it is unbelievable. Out of a virtual sea of tiny red, green and white lights, l could clearly see a pontoon with blue LED side lights from literally 2 miles away. That sold me.
We had a pair of 2 fatality wrecks (4 fatalities total) within a mile of each other an hour apart 8 years ago and the root cause was the larger, faster boat in each case did not see the tiny nav lights of the boats they ran over. (The second wreck happened because that boat captain was fixated on the law enforcement lights from the first wreck and ran over a jon boat right in front of him, killing two more people.) You won't convince me that would happen on a boat with 16 feet of LED lights.
When people say they can't tell which way a boat is moving (towards or away from you), I respond by saying you can see me from at least two miles away. You'll have plenty of time to decide on your course.
