First been there and feel your pain.  Best light for tracking, Coleman Lantern, next best light, like other said the one sold by the Wensels.

Wensel Bros Main Beams have become my "go-to" blood trailing light. I have some of these million candle power jobs - other flashlights and it just isn't needed anymore - the main beam is plenty bright enough and because it is small I think it helps me stay on sign keeps me from wandering - batteries too using only 2 I carry a back up battery pack but these things are very economical to run.
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Streamlight Stinger DS....and it's rechargable.

The latest PD30 goes even brighter now. It has a lot of adjustability from 15 lumens on up, not to mention the SOS and strobe features. I use mine every day at work as well. I call it my magic flashlight because I can find anything with it.

There's also a light for half the money that's available from Ron LaClair and The Nocking Point to name two. It is not quite as adjustable as the PD30 but you can adjust from spot to flood It also has an orange ring that glows when the batteries get low. It uses regular batteries.

The latest PD30 goes even brighter now. It has a lot of adjustability from 15 lumens on up, not to mention the SOS and strobe features. I use mine every day at work as well. I call it my magic flashlight because I can find anything with it. It's tough as nails too. If I could change anything, I'd make the body bright orange.

There's also a light for half the money that's available from Ron LaClair and The Nocking Point to name two. It is not quite as adjustable as the PD30 but you can adjust from spot to flood. It also has an orange ring that glows when the batteries get low. It uses regular batteries.

I've been there as well. One of the best lights in my opinion is a type of mag light, (not exactly sure who makes it as my family has had them for a long time) They are extremely bright and rechargable.

Back to Bud B's post.

Check out  http://www.unitedbloodtrackers.org/index.php?option=com_content&view=article&id=3&Itemid=6

The guys I know who are in UBT don't charge for tracking, or sometimes just gas milage. It's amazing what a tracking dog can follow.

Of course, in your case, he bled out not far from where you lost him and a better light might have done the trick.

in MA tracking dogs aren't legal so we have to rely on our eyes.   I also have a bottle of hydrogen peroxide and a sprayer nozzle handle too.  if you're unsure its bodily fluid under the artificial light, a quick spray will tell you.

I can understand the rational that they don't want dogs running deer. Most states that allow dog tracking require that the dog be kept on a leash. Michigan finally came around (only recently). Perhaps MA will eventually see the logic of recovering the animal instead of wasting it. Meantime, I guess the coyotes have to eat.

Ask the experts at  http://www.candlepowerforums.com/vb/content.php

I cary a solarforce with a rechargeable 18650 battery, instead of two CR-123 batteries. about half the price of the great Fenix lights.

I like,  http://www.lighthound.com/  if you don't want to order from directly from China

Rayovac makes a light called the indestructable.  It is so ar superior to the mag lights for brightness and battery life it isn't evena contest.  The light has a low and high setting and it is simply unbelieveable.  The battery life on the small one is something lie 6 hours on high and 9 hours on low.  On low it is even incredible.  We put it side by side to a $150 streamlight and all I can say is some people paid way to much for their flashlight.  God BLess