I just went through this myself. Youve got two simple options. One is get a NITECORE EXTREME and use just the head off of it. It will screw on the E1E body. Two you can get a TLS head from OPTICS HQ for the E1E. They only list one, its dual output, 20/140 lumens. They also have one they dont list which is a single output of 140 lumens but it only comes in HA finish. Theres also alot custom stuff you can get but its very hard to come by can be expensive. I went with the NITECORE EXTREME. Very well made and you access the different levels and modes by twisting the head.