I have a few Surefires (G2,Z2,6P) I have modded but they all take the P60 dropin. The E series does not take the P60 dropin. Ive never seen or read about a direct mod to replace the bulb although it is feasible but not pratical. You basically would have a direct drive light that would get hot very fast and loose charge very fast. There are three solutions that im familiar with. First the E to C converter. This converter allowes the use of the P60 dropin on your E1 body but you also have to replace the head (Bezel). Its not a cheap alternative 3 things to buy converter, head ,and dropin. Bought my Converter on Ebay Lumens Factory for about $20 Overready sells them for $32 the rest I already owned. Second there is also a Veleno E series dropin $75 nothing else to buy. Third lumens factory led E series replacement heat $20-$50. I hope that helps a little. As for nobody helping I dont think youre being ignored, its just the Surefire is not as popular on this site. My first question was about a Surefire and nobody responded LOL. For chinese lights this place is awesome and the group members are very helpful, if you dont want to spend allot of money do research on this site and you can get something that will match that E1 for way cheaper.