Ok. First try so be easy on me.
Got them last night Green and red.
Interesting little product. 5cm x 2cm x 2mm. Very small. Comes in it own plastic pouch which I would assume is considered water proof although I didn't test and would consider on the way you treat it, as the plastic was pretty flimsy. If you had a similar sized sturdy zip lock bag I would replace it with that if you wanted to better guarantee weather proofing but I can see not short term issues with it. It is designed to go into in of their protective reflective jackets anyway (which I got also) so would be well protected. I thought the additional jackets reduce the out slightly but not enough to warrant me not using it.
Light out put is dimm - Green brighter than red although may be just due to my perception.
surprisingly large [all] flood app 100 degree. But barely enough light to really define anything after a couple of meters (in total darkness and eyes adjusted) so no bush walking with this one.
3 modes fast flash, slow flash constant on. Have not run longevity tests but have no reason to doubt DNTactical (above post). Bit of a pain as I only wanted constant and you have to cycle through the modes to get to constant on, but I can see myself bringing a couple to work and use them in an emergency to identify myself more clearly in the dark (remote locality medic)
Strengths - well, can actually see it from quite a long way away. I dont know what a mile is but at least 200m when blinking (I tested in an urban environment)
The red I found is nice and deep and didn't look at all orange to me and green - nice and dark green.
Possible uses. Well I think they are perfect for reading (not a novel type activity but perhaps a map or instructions) at night whist trying to keep you night vision. There is a raised dot to activate the item so you can easily find it without the need of additional light sources. One thing though, shine it away from you when activating as looking directly at it when you turn it on it really does seem quite intense. If you kept one in a change pocket in your jeans you probably wouldn't even notice it was there.
There are other colours available and would depend on your needs. The different colors could easily indicate a chain of command in an emergency situation especially (and I work in an underground mine specifically). Gold for Scene leader, red for medic, green for worker bee's to easily identify personnel in a mine rescue team. I have no idea if they would be considered safe ie intrinsically safe. I wouldn't use it in a possible explosive environment but for training and if you carried a gas tester I think would be perfect.