I do not intend this to be argumentive or offend anyone, but the subject of lights such as this has come up on several threads.
It is dangerous to blind other boaters with a light and also dangerous to run with out a means to spot floating objects or snags in the water. The wardens I have come across at night would much less like to be out there investigating an accident than citing someone using a light for navigation. By the same token, the user should make certain that he does not cause problems for other boaters.
We have been blinded at times by boaters using hand held high power spotlights used carelessly which can put you in danger. I would squawk like mad at anyone doing that. I have also used handheld lights and seen how lighting up the inside of a boat blinds the operator of the boat. The worst offenders use the very high power hand held lights.
The only time a warden had words for me was when shrimping close to the shore with no lights showing, as you must show some light in order to be seen by others to prevent collision. Two drunks running at high speed near the bank nearly hit us within ten feet of the shore one night. We also had a boat showing no lights run directly in front of us once which we would have hit had we not had the light in operation.
That is exactly why we use the bow mounted light of only moderate intensity and never shine it at other boats. The light is aimed at the water directly in front of the boat and depressed so as not to blind other boaters. It is swung away from other boats or turned off to prevent blinding others.
Just using a little common sense makes the difference in running safely or being a problem for yourself or others. A proper bow light would have probably prevented the two men I referenced from being decapitated by running under an unlighted dock. They may have been using a handheld light, but who knows as they were the only people in the boat.
In another case in this area a man was wearing a headlight while running at night and ran into trees which killed him. The reflected light inside his boat prevented him from seeing the danger until it was too late.