Medic;
I've built and sold a couple hundred UV lights over the last a couple of years.
I started with eight 5mm 395nm LEDs powered by a lithium ion 1350 mah battery.
Then I tried 20 to 50 of the 5mm 380nm LEDs powered by 1800 mah lithium batteries.
Next came the 1 watt Cree UV 395 nm LEDs with 2200 mah lithium batteries.
Now, I build only Cree 3 watt 395 nm LED lights with 2400 mah Lithium batteries:
1. A single Cree 3 watt in an UltraFire C2 body.
2. A Triple 3 watt Cree in a double #18650 body.
Each light worked a little better for fluorescing the the common items such as urine, scorpions and UV dyes.
The 3 watt UV Crees are the leader in my testing.
Larry