Get one of these,
Dorcy cyberlight, $18 at amazon, I just got mine with an order of suncscreen (wishfull thinking in Seattle), truly blinding bright. Kind of a lesson in simple minds being easily amused, as my wife would point out, but did I mention it is really bright?
After a couple hundred hours of night sailing (last summer was HOT down here),
I've decided that "really bright" is a bad idea.
Even worse are those LED things on the hat or headband.
I won't let them on the boat any more.
Once eyes have adjusted to the dark, anything bright just ruins the night vision adaptation.
So I've collected several flashlights - of various sizes - to be used as needed.
The first line is the Mini Mag Light - with LED adapter. The batteries for the ones in the
cockpit were run through my camera first. They come out of there at about 1.2 volts.
That dims the light nicely, and aids the cause economically as well as saving the planet (a little bit).
Then there are a couple of Mini Mag lights below with fresh batteries ( the blue flashlights).
There are two "lanterns" in the cabin with C cells and incandescent bulbs.
They are for rooting around below and NEVER come on deck.
I found that the Sunbrella hatch cover can hang over the open hatch and act as a
light screen. But a large towel will work as well.
A good pair of 7X50 binoculars are a God-send.
They are a lot more helpful for seeing what's out there than any kind of light.
Lastly, when dusk is approaching, go through the boat and get her ready for "Night Ops".
Everything stowed, nothing in the way to trip over.
Lights, water, floats, (RUM), jacket, towel, etc. all located where they can be found and fetched easily.
Then kick back and enjoy the ride.