Cheers pal I've also got a asian scorpion do I might try it on her. Advice very much appreciatedLighting is debatable. Some people use it others don't. I use it less than at first.
I am assuming you are trying to recreate moonlight. It may work in having the T become more active and visible. You mentioned neon, I am not sure how that differs from the blue you can get from LEDs, such as are used for aquariums. LEDs may be better and likely cheaper.
Tarantulas apparently can't see red light and it has been my experience that Ts can be active in that light, if you can stand it yourself. If you want to observe them as they likely would act in darkness, try the red.
As for blue, I have not tried it.
I use lights less as I work most nights so I am not there.