can i put a uv tube light under my plants in bud

the type u get in an aquarium the blue light one as under my plant there not getting much light in fact a couple of the bottom small branches have started 2 dies back and some are light green dues to not enough light as i put to many plants in the cupboard lol well its a small room about 150cm wide n 100cm depth and 7 foot high i have a 600 watt hps build in there with in take out take fans and filter a lot of leaves dropped off early in bud and i took a few more off to let more light through but still not enough so can i add that tube light and will it help i dont have the funds to get a proper one from shop plz help any advice welcome also now that my plant are at there tallest at the top it gets to 30 temp i think this may two high how can i change it its only at top of the plant tnks also growing in mft tray hydro with bubbles if any one has any advice for me plz reply help me i had my first attempt die on me so need to compensate with these baby's lol

Yes a uv light tube will help. I would not put it under your plants though. You should put it at the top and allow the light to reach the top of the canopy. Any thing that doesn't get light below the canopy can be removed. I would NOT remove anything from the top to allow light to the bottom. Just my opinion though. If you do not want to remove the under growth you can hang your uv lights vertically. I've heard claims that all the undergrowth filled in pretty well. If you are using a T5 high out put fixture I would use these bulbs: http://www.aquariumspecialty.com/uv-lighting-red-sun-t5-lamp and these too: http://www.aquariumspecialty.com/korallen-zucht-fiji-purple-t5-lamp. Both of these together really help promote bud growth. They are at the perfect spectrum so no energy is being wasted producing yellow and green light. Check out this thread for more info with aquarium lighting. https://www.rollitup.org/indoor-growing/358190-led-without-leds-my-first.html. The pr0f has really done all the work just read.

why uv lights ? ? ?

They make fluro lights now that are the same light spectrum as led's. So it's the perfect light spectrum for your plants. Meaning in theory no wasted light is produced. Look at the links and you will know more.

tnks guys i think ill try putting tube light virtical n see what happens do u mean cdut all the smaller buds off the bottom would this help the to buds 2 grow quicker tnks for advice

Agreed, its meant for supplemental light. So adding it vertically wil def help. I doubt your buds will grow quicker, but healthier and stronger. If you get the sun red and those purple fiji, it will help your bud. The red is supposed to help resin production, and promote internode growth (bud growth). The blue lights and white lights are great for veg. but check this link for more scientific research. -------> https://www.rollitup.org/indoor-growing/358190-led-without-leds-my-first.html
The bottow third of my plant is completely bare. For me I've seen bigger buds up top. So in the end I get large grade A nuggs instead of leaving the undergrowth on, and ending with lots of B and C grade nugs.