I find the Edison Opto Lamps fits in a 50 mm HT sewer pipe!
Now all I need to do is find a mounting system.  One option is a reflector clamp with V brake semi-circle shims.

Here is a cannibalized handle bar clamp from an old Aldi lamp.
On the first mtn bike ride the clamp flies apart!

The biggest problem is the mounting. 

A handle bar clamp made from a handle bar bag clamp.   Battery mounted external in water bottle.

He I used a quick disconnect cannibalized from a dead Cateye Opticube HL
EL 300 glued on the sewer pipe. 
This can be used with the Cateye H31/32 Clamp system.

I found a low cost 12V Li Ion battery on Ebay!  8 hour burn time?
Tubelight "torch" with integrated 4500 mah 12 Volt Li Ion battery.
A slot is cut by hand in the tube to adapt the Cateye H32 clamp.

Possible housing designs for the tubelight torch. The "tubelight torch" idea is abandoned since the Li Ion battery was not reliable.

Eureka!  The Cateye base for the H31/H32 is discovered on the now defunk SK lights website.
An epoxy/glass fiber adapter plate is fabricated to adapt the 52 mm diameter to the flat Cateye base.  

The "Tubelight" is now a practical solution!

The Tubelight gets better;  the batteries are now under the handle bar stem. 

I wanted to eliminate the HT sewer pipe and integrate the base system in the lamp itself.    I stumble upon Fimo looking for molding clay to make silicon casting forms for liquid epoxy castings.   Fimo is brittle and so is epoxy without glass fibers so I added glass fibers to the Fimo like I did with Epoxy.    Success!
Milliput and two part epoxy putty are discovered when I was  searching for other stuff on the Internet.   

Fimo "straight" prototype show here.   The Alien Eye has more curves, less material to fill and looks better. 

A LED shop informs me that Edison Opto has a Ultra-cool light.    Still brighter and draws the same current. 

August 2009:  The Alien Eye!
The successful end of a 1 year development project!