Pros: The best value in UV lights anywhere. Good light output. Good battery life. Build quality is pretty decent. nice wrist strap. Handles 18650 or RCR123 very well

Cons: Beam artifacts and devergence is horrible (as most non white LEDS tend to be. Clicky is stiff but never fails to work

Other Thoughts: If you have a use for UV light- this is the way to go. Good runtime, good output and a very reasonable price.

Bottomline: I have dozens of light from DX- I've yet to get a bum one and once again this is a cool light- I got it for my Dad- but after looking at some flouresenct rocks I may just order another one.

Pros: - Very cool effect. Fluoresces things just like a blacklight.
- Fairly bright. I would estimate it has about 80 lumens of UV light.
- Host is good, although very common. I have 4 of these same types of host bodies now. Great for pop ins of other emitters.
- Charges GITD material instantly.

Cons: - No clip. Not sure why the title says it has a clip, but this host has never had clips from the 4 others I have.
- The host body is nice and looks good, but as said in other reviews, the paint chips right off, so don't drop it.
- Beam is pretty diffused, which is not really a horrible thing but the beam-spot is misshaped, messy, and is not consistent.

Other Thoughts: - Reverse clicky
- Works fine with 3.6v rechargables.

Bottomline: Great light to play around with. This is a good compliment to any powerful violet laser. Great for portable powerful UV when you need it or just want to make stuff glow/fluoresce!

Pros: The real perfect UV light to search for leakage (with Rhodamin or Fluoresceine)
funge-infestation (dermatological)
and search for human/animal bodyfluids.
Working very fine, normal use with one
rechargable 18650 or two 16340 (3V or 3.7V) for higher output.
I did not have the troubles other users
have discribed, the building quality is 100% and the output definitely higher than the 1/2 or 1 Watt UV led-emitter wich is sold by Deal Extreme also.
Any other UV light (multiled and another build with a 1 Watt UV emitter)
I have in posession is NO match for this Ultrafire

Cons: None actually, exept the focussing of the led, the reflector should be twisted about 1/2-1 turn back so a sharp focus can be realised wich also extends the throw .
After adjusting fix the focussing with a few drops of cyanoacrylate

Other Thoughts: Carefull with you eyes, the -mostly invisable- output can cause damage.

Bottomline: For everyone who works with dyes and/or other scientific stuff, like minerals gemstones, UV hardening glue, biologists searching for traces of urine, semen and so on, should consider to buy this unit.
Also usefull as a blacklight during parties.

Pros: This is a very cheap light.
The body is a P60 compatible host and so you have a variety of drop ins available.
The light can run on both RCR123A and 18650 batteries.
Has O rings on the head and tail to prevent water from entering.

Cons: The threads squeek a lot on opening.
The tail clicky switch is very hard to press.

Other Thoughts: You can buy the 9V Xenon bulbs online at DealExtreme and use them in this light.
You can also buy the R2 drop in.
This light is thus very flexible and can accomodate a variety of drop ins and batteries.

Bottomline: All the options available make this a wonderful light to have