SureFire KL1
LED Bezel (Old Style)
Produced by Surefire

The SureFire KL1 is a digitally regulated LED bezel upgrade for the Surefire E1(e) & E2(e).
It will run at 100% brightness in the E2(e) for 4.5 hours & near 100% brightness in the E1(e)
for 1.5 hours followed by many additional hours of low level light output.

The KL1 produces ~17 lumens for 4.5 hours of continuous brightness on the E2 & E2e.
The KL1 produces ~17 lumens for 1.5 hours of continuous brightness on the E1 & E1e.
 

Here is the newest shipping version with a beveled edge so when you place it face down while
it's on you will see light seeping out.  It's a great concept that can keep you from accidentally
running down your batteries.
 
 

The KL1 bezel is just slightly longer than the original bezel and will fit on all E series Surefires.
Using the KL1 on a non-Elite E1 or E2 means you have to give up the pocket clip since it was
attached to the bezel.  The new Executive Elite series has the pocket clip attached the body.
 
 

This gives you an idea of the physical size increase of the KL1 compared to the standard bezel.
 
 

Runtime tests I have done show that with the KL1 on the E2 I get 4 hours & 10 minutes of constant brightness.
With the E1 I get over 1 3/4  hours of near constant (90%) brightness,
dropping to 70% at 2 hours and 30% at 2 1/4 hours.
 

This is a comparison shot between the stock E1 @ 15 lumens and the Surefire KL1 @ 17 lumens.
 

This is a comparison shot between the E2 w/MN02 @ 25 lumens and the Surefire KL1 @ 17 lumens.
 
 

This is a comparison shot between the Surefire KL1, Arc LS running at ~400mA
and an Arc LS1 rev2 running at 330mA.