This is going a little off topic but the MN01 SF lamp for the E1e is rated at about 15 lumens and costs about $15 (from SF) with a runtime of about 90 minutes. The Lumens Factory HO-E1A is rated at 40 lumens and costs about $12 (at Lighthound) with a runtime of about 65 minutes.
The SF KX1 LED conversion for the E1e is rated at 45 lumens on high and 3 lumens on low, costs $66, should last for years, and has runtime with "useful light levels" of 40 hours. That means it won't run at high for that long but you'd be surprised at how usable a light with only 3 lumens is. Of course, incans and LED's produce different light and there are some uses for either that are better than the other.
The thing to remember/consider is that like most SF lights, the E1e is pretty modular and that gives you options. You can customize your light easily with factory parts. That's just one reason why SF lights are popular here.