For others who probably never heard of UV (which is absolutely fine), this isn't some techie perfectionist thing. It makes a big difference to the whole ride, scenes will be very different depending on the lighting. It currently looks like they're using LED UV in this Duel revamp.
LED is a god send for nightclubs and street lights. But not for scenic effects like a naturalistic look or scenic blacklight. I spoke to someone I know in the film industry who says LED lamps are avoided wherever possible in professional studios, but are often used for reliability & cost.
The Haunted House originally used blacklight more as a lighting 'illusion', not as 'glow in the dark'. The ride began with a natural 'candlelight' look, then the scenes got surreal as the ride went on.
Most scenes had painted-on detail, by a professional scenic studio that specialised in blacklight (who turned down a Disneyland Paris attraction to do Haunted House). It used careful UV to give the illusion of depth & texture in darkness, then spotlighting parts in tungsten for surprises and effects. Vivid, but not a ghost trainy 'glow in the dark' look.
The blacklight was actually removed between 93 and 95, because the park decided to remarket it as a straightforward horror ghost train (at the loss of the original character).
LED UV can produce a lot of excess visible light, making the sets look flat and bathed purple, so hopefully they're not going to end up with this. Standard flourescent tubes don't last as long but are still very easily to source and replace. Most the original blacklight scenery has largely faded anyway, or was painted over with cheaper 'ghost trainy' UV between 1995 and 2003.
Also, the flying heads used UV strobes - standard strobe bulbs with Wood's Glass filters on (since you cant strobe a flourescent tube - and you needed to use true blacklight or it would show up the mechanisms). However the original filters were binned a few years ago and Woods glass is not manufactured much anymore.