IMHO, all sailboats, except inland small lake daysailers, really need both deck level and a mast top tricolor. The reason for this is simple, the deck level lights are necesary when in close traffic situations like in a busy harbor, especially with small powerboats, which don't generally look up...the mast top tricolor is a necessity when sailing in open waters, especially in heavy seas, where deck level lights may be obscured as I said above.
Okay, you convinced me. I ordered one of the Argo Navis LX Series TriAnchor lights pictured earlier in this thread. I bought one with the tri color, anchor and strobe, and with the photocell to turn the anchor off at dawn.
It arrived Friday. Its a very, very nice light. Its small, relatively light and completely sealed. Sailor's Solutions included a bracket, but I bought the other type of bracket just in case (they said I can return whichever I don't use).
I am, however, disappointed in the strobe. I was expecting it to have a super bright flash tube that could be seen on Mars. I figured that in the worse of circumstances, if I need to be located and rescued, I could turn it on to help people find me. That said, the "strobe" on this device is not useful. All it does it turn the anchor light on and off. Its no brighter than the anchor light, so its of minimal utility.
This device uses 3 wires, as opposed to the one without the strobe that needs only 2. I have already opened it, stripped back the wires and tested it on a power supply, so I'm pretty much stuck with it. That's fine, I'll install it. I already have the triplex wire for it anyhow.
Other than the strobe issue, I am very happy with it.