SUREFIRE E2e MODIFICATIONS
Judging for the mail I get from people, there is some interest in modifying the E2e (or E2O) for more lumen output.
The standard question is: Do you have any lamp that will make the E2e brighter?
There are two modifications made to the E2e to make it brighter. Both of them involve the P-61 lamp from Surefire, an incandescent lamp that output 120 lumens for 20 minutes.
The NASCAR modification (more properly named This_is_Nascar, for its developer), involves removing the stock reflector from the P-81 lamp and using the head and reflector of the standard E2e.
On top is the E to C adaptor model, below is the NASCAR model.
And this is the E to C adaptor on top and below the NASCAR modification.
It is necessary to stretch the bezel of the E2e to accommodate the longer P-61 lamp. This is accomplished by installing an O ring between the head and bezel and using a thinner mineral crystal instead of the Pyrex lens.
A washer is also used to bring the lamp to the proper focal point in the reflector. This modification has a run time of seven minutes, when the heat of running the 120 lumen lamp will reach the batteries, causing them to kick the thermal protection. This stops the juice to the lamp. Of course, after the batteries cool down, the light can be used again.
This happens because of the little mass of metal at the head and reflector. If there was more mass of metal at this point the heat would be absorbed (and displaced forward as infrared) and the batteries would continue to provide the full run time of twenty minutes.
And it is here where the second modification makes its appearance; by using an adaptor to bridge the gap between the E series body and a C series head. It is possible to use the P-61 lamp without removing the reflector. All the mass of the adaptor, coupled with the bigger head and the mass of the reflector, perfectly handles the heat of the powerful P-61 lamp, and the full run time of twenty minutes can be achieved, as well as less heat in the part of the light that is held by your hand.
There are a couple of versions in the market of this E to C adaptor. The one shown here was made by Doug Speck in Toronto, Canada. It is hard anodized to match the body of the E2e (or E2O) and the Z-44 (The head of the Surefire Centurion II).
Also, as the reflector (and head) are bigger, the range (throw) is increased over the smaller reflector of the stock E2e. Not to mention changing lamps is a breeze.
For more run time, the P-60 lamp (65 lumens) can be substituted; it will give the light one hour run time with much better throw than the stock E2e.
The NASCAR version has some use when somebody desires a rifle light in the smaller format with an intensity of 120 “real” lumens, and a good flood coverage for clearing rooms. Using a 1” scope ring and a plastic bushing, it is possible to mount the light to any Picattiny or Weaver base.
Best regards,
Black Bear