Don’t have any mod tips but I still use two NW H60s (version 1 and version 2), the tints are slightly different, but decent to my eyes. Efficiency isn’t going to be as good as an XP-L/XM-L but the battery lasts long enough still at the brightness typically used. One of the selling points was the bare LED light pattern, I was surprised that they discontinued their reflectorless headlamps, maybe they didn’t sell as well as the ones with reflectors.
That’s a great find although a sad loss for the original owner.