The Streamlight Stinger is the probably the most used duty
flashlight in the US with good reason. The Stinger is a very durable proven
light. With the external charge ability it eliminates the need to remove the
battery stick like the Surefire lights. Battery life is average at one hour of
continuous use and charge time is long at ten hours or two and half for the
quick charge. The local police equipment store charges $125 for this excellent
light. Now there is a new kid on the block that may give the Stinger a run for
its money.

I purchased the Inova T4 back in October. This is my new
favorite duty light. The diameter is the same as the Stinger, so it fits in my
Stallion light holder. The dual light output (175/40 lumen) is very
functional. It also has a strobe feature for building searches, and the switch
can be momentary or constant on. Run time is superb at two hours at maximum output
and ten hours for low. The checkering on the body feels good and provides for a
positive grip. The Inova felt lighter the first time I picked it up. Checking
the web sites proved I was right. The T4 weighs in at 9.81oz versus 10oz for
the Stinger. The head is smaller as well. The T4 is little longer at 8”
versus 7.38” for the Stinger. The LED in front of the switch will glow red when it is charging and be green when it fully charged (no more guessing). The light came with one charging head and an AC
charger as well as a DC charger. The T4 is harder to get seated in the charger
than the Stinger but I don’t think it will ever accidentally fall out.  The local police equipment store charged me $139.

I’ve used this light now for two months with no problems.
Forgetting to turn it off does not result in the lens getting melted like the
Stinger. The extra hour run time is useful when you are tracking suspects all
over the place, and the low setting is fine for traffic posts and crime scenes
where you can be stuck all night. The beam could be focused tighter to provide
a better spot. There is no spot with this light unless you are closer than 10’.
This is the only negative I can find with it. I haven’t come across a situation
where the spot would have found something/ someone faster than what I did
without it, but you should be aware.

Now for the warning. This is the new model. A lot of the
T4’s sold on the internet are the old model that is 100 lumen only with none
of the nifty features of high/low or the momentary on/off. Make sure you are buying
the newest version before you spend your $$$.

The first pictures are side by side comparison.

This is the Stinger from the top of my basement stairs:

Now the T4:

The extra lumens definetly make a difference.  

I am in no way affiliated with Inova. I do believe in making an informed purchase, money doesn't grow on trees and buying something you don't like is a hard way to learn. So there is my review. Please no comments on my crappy house keeping.