twocik23,
The LED light you specced only has 8000 MCD...
You should be using 16,000MCD; they double the light output with only a small rise in current draw.
Ultimately you want to etch a custom desgined circuit board; that way you get better results with a large ground plane, straigther power lines, etc.
You can get white LEDs with viewing angles of between 20-25 degress in the purported 100,000 mcd range. They take about 25mA max. This is, however, under optimal conditions, and probably not with a battery pack alone; you would need conditioned DC power with a low resistance and VERY stiff source. I doubt that the panny batteries, even Li-Ion types, would generate the type of clean, stiff, DC needed. You would have to design a filtered/buffered circuit to get the type of output needed. Cypress Semi makes ICs for this, but it still requires some discrete components to complete. With SMT (surface mount technology) this would be a small pcb, maybe 1.5"x1.5".
Just a thought...