Finally a topic I have some experience with... DIY light installation!
Our previous boat was a SeaSport 2400 that came with a deck light for cockpit illumination. It was a big incandescent 4x5 attached to the underside of our radar arch. After a little research I settled on Rigid Industries for my lighting needs. Powder-coated aluminum body, stainless fittings and shatterproof acrylic lens.
I used their SM series (3x2, 3-element, clear lens) flood lights to replace the deck light and add two floods to the top of the radar arch rotated and angled down off each bow gunnel for a "soft" docking light.
I added another SM series spot on the brow of the forward cabin overhang. This light had marginal impact other than making yourself seen without blinding oncoming vessels. It also illuminated a portion of my bow and bow railing... NOT good!
Lastly, my final and most costly light project was a fixed, bow rail-mounted, 8" flood/spot combo. I confirmed with the rail mfr that the top rail was not impeded at the vertical stanchions, so I could snake wiring from the new light to a point I could extract wiring and penetrate the cabin wall to dashboard. This light did not restrict visibility day or night and provided superior illumination for night time travel. Having said that we can all understand the risk of travelling at night! B - O - A - T... bring out another thousand! (just this light)
Good luck with your little project!
Bob & Kim
The Doghouse 2