The issue isn’t the original intent of the photographer, it’s the fact the film has been digitised.
They're scanned from negatives (rather than prints) so are true to the original colours from the camera, close enough to be a good impression of what the ride originally looked like to the eye.
The guys behind the lighting of this are from a theatre background
I'm sure they are capable and I'm not questioning their skills. I also understand its very hard work retrofitting and fixing an old dark ride on a budget.
But, professional theatre knowledge and knowing how bespoke dark ride lighting/scenic effects were made in the 90s, are two slightly different things. We no longer have a busy British dark ride industry that learnt this stuff for years by the time Haunted House opened (and exported to all over Europe). It would take a lot of learning and reverse engineering to get things to a higher standard. If they're trying to be true to the original and enhance it for today, have Alton Towers done technical research on the ride?
Haunted House had a very particular set up originally, which wasn't to create a 'glow in the dark' look but was to allow the original scenery & blacklight tricks to work in darkness. Some of it was simple, some of it was experimental. Such as using custom mixed UV paints by a specialist studio, which gave a different effect to standard flourescent colours. Also UV lighting on large open areas like the garden/swamp had rarely been done - how do you hide the light sources when the car turns to face both directions in an open set? Interesting stuff!
now one thing they might have to contend with is equipment acquired at a price but they will do the best they can with what they have.
I can't think of any budget reason that would force them to go with UV though? The original blacklight details have mostly since been lost anyway. Any UV paint left in there will probably be from the Duel refurbishment, which did use the cheap flourescent colours. LED UV may brighten & cheapen the scenes even further if theyre not careful, so hopefully theyre on to this?
Perhaps relighting in colour would have been a better result for much less hassle?
Then to find a retro solution for the flying heads. A rapid Woods Glass strobe, with touched up UV paint on the flying heads, would produce a fantastic effect like we havn't seen work for many, many years. If they could restore this, since the glass is difficult to source today, would be very impressed with their skills!
Just being constructive
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Nail this, on a budget, and the ride would be transformed for everyone.