UV lights and practicalities for the solo show in May

I went to visit the space again on Friday last week to visualise the work that i am planning to make there. I am planning to use uv lights and go round marks on the walls and maybe the floor with a uv pen, which i have mentioned about in my previous post. I need to carefully think about how practical it is to fill in the space with uv lights and plan my timing right as it is a big piece of work and i will have only 4 days to do it. 

One of the first things that i though about when i was in the room is how i am going to get uv lights which are strong enough to fill the space and if i wanted to replace every single light with uv light how expensive it might be. I could see that the normal lights didn't shine equally throughout the room, it was patchy, so the marks that i go round with a uv pen near the light source will look the brightest compared to the marks that are further down and some distance away. This made me think about the use of only one light source, however this seems impossible as i don't think there is a light bright enough to fill the whole room and make all the marks on the wall that i work with to show though bright enough to make an effect. 

If i was to replace the lights with uv lights would it be better to then work on the floor alone, as it will get the most even lighting in the room? Would that be enough?

Another thing that i have thought about is the way i want my work to interact with the audience. At first i wanted for the lights to change after a certain time period to normal lights and keep changing between uv and normal so to surprise people and see their reaction to my work suddenly appearing before them. This is a challenge as i don't know how to make the lights change. Can it be done manually? can there be a single normal bulb in the middle of the room that gets switched on after the uv lights are switched off? If i cant have the element of surprise then can i give hand held uv torches to go round the room and interact with my work that way? Will that be as effective? hmm...

The first option sounds as a performance where people physically react to my work as it suddenly appears around them, compared to the second one where people engage with the work differently, exploring it in a different kind of way. Audience would only see the marks that i worked with within the radius of the hand held torch and not the room as a whole. 

~Ev