Description:
4 Watt LED (believed to be a LuxIII(3W) over driven to 4W)
Clickie Switch on side of body
Tiros Focusing Optic
2 Hour Runtime
Charging cradle, with 120V and 12V power cords.
Rechargeable Lithium Battery

First Impressions:
The Inova T4 was presented very well in its packaging.
The light itself was held in place with formed foam.
The charging cradle and power cords were in their own separate boxes inside the main box.

As with all Inova products, the fit and finish of the T4 are excellent. There are no rough edges or machining marks.
The light has a very solid feel, and the black anodizing looks very even and uniform.

The light itself was alittle larger than I originally though. Mainly in length, this is due to the switch being on the side of the light, instead of a tailswitch, and due to the T4's special focusing optic, called a Tiros optic. The Tiros optic is over an inch long, so it takes up a good bit of room in the head of the light.
The advantage to this is, the optic is able to focus 90% of the light in a tight beam. This is usually done with a much larger diameter reflector, which would make the head of the light alot larger.
The drawback is that there is not much spill light, or flood. All the light is in a focused spot.

Size/Weight:
Since Inova lights are so well made, they are slightly on the heavy side usually. The light weight Li-Ion battery helps counteract this though.

Grip/Handling:
The new T series from Inova have an interesting knurling effect.
They all have a grid of raised squares, instead of the typical smaller raised triangles used in most knurling.
Its a very nice effect, they feel softer to the skin, yet they are deep enough to provide plenty of grip.
I typically like tail switches better than body switches, but with a light this size I found it didnt feel bad at all to use the switch on the side of the body. It was fairly well balanced in a couple different orientations.

Build Quality:
As I stated above, all Inova products are built really well.
They can take a beating, are fairly water tight, and the fit and finish is great.

Features:
I think the most important feature of the T4 is its charging cradle.
You can run it off 120V or 12V from your cigarette lighter plug.
Or even hardwire it into the vehicles 12V system like I did.
The charging cradle has 2 spring loaded rollers that clamp around the light when you press it down.
These hold the T4 in place very well, so the system can be trusted to stay in place no matter how you mount it.

There are 2 contacts on the under side of the light, and on the cradle, these lineup surprisingly well when you place the light in the cradle.
A blue led charging indicator will light up letting you know you are connected and charging.
The light goes out when its fully charged.
There are also some safety features built into the charger, which is a good idea since the T4 uses a Li-Ion battery. It will not charge the battery of the charger is over 115 degrees. This is a nice feature due to the fact that is can get very hot in a vehicle in the summer.
My T4 is so hot I cant touch it sometimes when I get in my truck. This should not hurt the light, but I would not recommend using the light when its that hot. Let it cool down a bit before using it. The light will function when its that hot, but you will shorten the life of the LED.

I have tested the T4 with a Pila 168s, and it worked fine.
Output seemed to be the same as with the provided cell.
I do NOT recommend charging the Pila cell in the T4 though.
But it is nice to have the option to power the light with an alternative cell.
Do not use 2x123s in the T4, even though they will fit.

Output:
My T4 measures 1760 Lux
The T4s beam is quite different from many lights.
The Tiros optic focuses 90% of the light in a medium sized spot.
Surrounded by a few faint rings making up what little spill light there is.
This may bother some people that like perfect beams with no artifacts.
Though in normal outdoor use, it is not noticeable.
I would not recommend the T4 for closeup work, the lack of spill light can make it hard to use for closeup objects.
Outside is a different story. The T4 throws very well for its size, it will project a nice size hotspot.
It has performed really well as a truck light for me. The tight focused beam throws well,
and I am not casting a wide floor that could reflect back in my eyes at night while driving on offroad trails. Plus, it just looks really cool in fog. ;)

Runtime:
The T4 is rated at 2 hours of regulated output.
Independent tests have shown this to be true, running alittle over 2 hours before it starts to dim.
The light will drop in output rather quickly after it drops out of regulation,
and will be completely dead approximately 20 minutes after it drops out of regulation.

Heat Issues:
I have not had the T4 running for more than about 20 continuous minutes.
I would not consider it hot after time, and was still very comfortable to hold.
The light should be fine to run unattended for its entire runtime.

Pros:
Throws well for its relatively small diameter head.
Regulated output.
Rechargeable Lithium cell.
Charging Cradle.
Good build quality.
Able to stand on tail.
Replacement lens are available from Inova.

Cons:
Slightly on the long side, due to the long Tiros Optic.
No Lanyard attachment point.
Rings surrounding the hotspot, which are used to create some side spill.
 

General Comments:
When inserting the battery, make sure the positive end is facing the Tail of the light.
This is the opposite of most lights.

I have tested the T4 with a Pila 168s, and it worked fine.
Output seemed to be the same as with the provided cell.
I do NOT recommend charging the Pila cell in the T4 though.
But it is nice to have the option to power the light with an alternative cell.
Do NOT use 2x123s in the T4, even though they will fit.

Conclusion:
I am very pleased with the Inova T4.
I was drawn to the light for its charging cradle,
and thought it would be a great light to mount in the truck.
And it has been. This is a great light for a fixed application,
where you always the light to stay in one place,
and be ready when you need it.