Looking into updating my mast headlight and deck light to LED. Misea/Signalmate has a combination unit with either a red or white deck light. Have not seen the red offered by others but seems to me a very good idea. Marinebeam has a nice and much less expensive unit with white only for the deck light. Any experience with red deck lights?
I'm using an Aqua Signal Series 41 Steaming/foredeck combo, nice unit, though perhaps a bit 'bulky' on a boat as small as mine... Not a problem, though, I like 'oversized' when it comes to running lights

Seems considerably less expensive than the Misea, they occasionally show up on eBay, I found mine at a consignment shop for about $75...
They come with a standard "tractor light", which I swapped out for an LED about a year ago... Turned out to be a HUGE improvement over the original incandescent or halogen, whatever it was...
I, too, was thinking about going to a colored lens, red or yellow... But I went with a soft white, which is almost more of a very pale yellow, and for me it turned out to be the right choice... (If you do decide to go this route, it really pays to shop around, prices for these replacement LED tractor lamps are all over the place, I think I scored mine on eBay for under $30. )
While the LED appears to be a bit less directional or 'intense', it seems to offer far greater illumination in a much greater arc surrounding the boat... Seems to be a 'softer' light than the previous incandescent, which surprised me a bit, but I think might translate to a bit less of a loss of night vision. The greater arc of illumination is a big advantage in a foredeck light, IMHO, and could be critical in an emergency situation such as a MOB recovery. I first noticed the difference coming back into my lagoon late at night, a narrow, twisting waterway that is getting narrower each year, as more residents add boat lifts, jet ski docks and other projections that further encroach on the canal. The LED does a far superior job of illuminating the sides of my lagoon, and thus would be of great benefit in situations like entering a slip in a marina, or weaving thru a crowded mooring field in the dark. Not too long ago I had crossed Albemarle Sound late at night to beat some weather, and was looking to anchor up just outside of the channel for the night. Problem with that area, it's littered with crab pots, and the foredeck light on the boat I was running was really lame. A light like mine would have been very beneficial in that situation...
For spreader or deck lights, I think the concern over the loss of night vision is a bit overstated, and I really don't think I'm suffering much of a loss of night vision at all with the light I'm using now... And, in many instances like those I've mentioned above, you might be most likely to be using a foredeck light when anchoring, coming into a dock, etc - when you're basically 'finished' for the night, anyway...