Those are great emergency headlamps, in my opinion, but not great for sustained use. Coin cells just don't do well at sustained current draw. If you use your E-Lite for extended periods, don't be surprised if brightness drops off rapidly (most coin cell lights have a serious brightness dropoff after even 5 minutes of sustained use). If your planned usage is short in nature, you'll probably be fine, but I am also not a huge fan of coin cell capacities either (maybe I'm just being too grumpy about it, ha).
I think the perfect niche for the E-Lite is in a lightweight, small size Bug Out Bag or emergency kit (or whatever preparedness package you want to call it). Some sort of kit where every ounce counts but you still need an emergency light.
There are a lot of other clip/headlamps these days that I think would do better for sustained usage periods though.
I really like the
Zebralight H50, personally, but it's definitely a different creature than the E-Lite. It only has one main LED (a CREE) but has three modes (low, med, hi). It runs regulated for constant brightness off a single AA and is purely flood with great runtimes. This makes it great for hands-free work up close like you are describing. You can use it as a headlamp or as a clip light, or attach it to some straps/webbing (they include a lot of accessories).
I use one on low every night as a reading light. I run it off an Eneloop rechargeable and unless I go to use it for other duties on the higher levels, it seems to keep going forever without a charge. If I'm doing work with my hands I'll use it on Med or occasionally High, depending on ambient lighting conditions and how my eyes are adjusted. Stuffing a lithium primary cell in it gives even MORE impressive runtimes.
There are lots of reviews out there on it, but I always like this guy's since it's very much real world usage:
http://www.candlepowerforums.com/vb/showthread.php?t=178839
It's more expensive, has different features, and is a different animal. I'm not saying it's a replacement for the E-Lite, just that I find mine handy for the type of usage you're describing. I don't think an E-Lite is necessarily a
bad choice for what you're describing, I just think that you might have to change out the coin cell often and I wonder how the plastic parts might hold up to the inevitable banging around they will receive from an active law enforcement officer.