Eric has a post up about a flashlight I'm developing. I'm not going to tell you everything about it in a public forum - yet. Let me just say that it is quite small and uses ordinary batteries. The prototype pictured below uses a standard 6 volt lantern battery case because they are low cost and have lots of room inside for doing different variations. Here is a picture Eric took of the prototype.
Interested parties can leave a comment here or contact me by e-mail.
And if you are concerned about my engineering ability you can read my columns at ECN Magazine. I have done everything from commercial work to aerospace engineering with a focus on Research and Development.