I've come to realize that my Princeton Tec EOS are just not going to cut it now that I bike in more traffic and more streetlighted areas. It's my eyes not adjusting fast enough when confronted with headlights or streetlights and then darkness. I need more light.
I decided against the Batteryspace/TrailTech HID though primarily because of the helmet mount. I switch between several bikes hence the desire for a helmet light. Riding positions on the bikes vary considerably so I wasn't too keen on the lack of adjustment on the Trailtech helmet mount. And the final factor was the HID lag on startup. I would like to be courteous to the handful of joggers and peds I meet. These are usually on dark roads where my Princeton Tec currently serves me well so I could optionally shutdown the light for them, or if the mount allowed, aim it almost straight down for a time. Neither is an option with the Trailtech HID. Although as I write this - it occurs to me that shutting down the hid would probably not be a viable option even with the handlebar mounted EOS - it would be the same problem I experience now going from bright to shadows and not having enough time for my eyes to adjust. So it's all about the mount.
I opted for this instead - it's highly regarded everywhere I could find a review.
Jet Lites Phantom Helmet Mount with smart switch. It's a halogen. I really wanted the HID but I just couldn't justify the extra cost. Particularly with all the raves I read at MTBR on this and the beam comparison phots there too. I found it for $210 shipped.
Damn I'm long winded ..