I've been trawling the www at length re. the LED nav subject. I've bought the Hella P&S LED's, but don't go much on their 'all-round' white. Other options are the stumpy Aqua Signal, the NASA Supernova and the Lopolight. No one appears to know much about the NASA and the bracket looks flimsy and the Lopo is pushing £250.
A fortune for one navlight unless you're in the Cookee league.
So, that leaves 'Old Stumpy'.
Oh yeah, Perko is a good old fashion Yank manufacturer that do make a LED , but you'll a quiet 2 days to nav their sit.