Mix HID LED UVB question

Hello all. Was hoping my first post would be informative rather than a question but ah what can you do

My first question is this. I have a fairly narrow grow room which is actually half of my double sliding door closet. Estimated specs are about 2x2x6.
i have a ballast thats 600w that I got from my job so decided to go with that as all I have to do is get a HPS bulb. Now I was also thinking of getting a 90w led ufo to add additional reds and blues to the plant. Is that too much for such a small space?

Second question is for UVB. Can I use a CFL for UVB? its rated at 10% UVB which seems to be fairly good but is there any difference from using a regular screw in reptile lamp? I was thinking of going with the CFL due to less heat as I have less space. I wanna bake my baby AFTER harvesting not before

I just want to grow one at a time for now as this is my first grow. Is the space too small for my plant (mostly indica)?

Thanks for all the feedback I get in advance.

the hps itself is kinda pushing it, so i wouldn't wanna put any more lights in there, a plant will grow fine even through veg with the hps...

plenty of space for 1-2 plants and a 600 w hps is almost overkill so adding more light would be a waste of electric. I would worry about getting enough venting to cool that much light