I agree, it is cheaper building it yourself but if you want to see the latest in hi-tec led lighting check out this link

http://www.cyclescience.co.nz/nite-lights-900-lumens-rechargeable-xidp265039.html

It has all the mounting hardware for handlebar, head/helmet, li-ion battery, 3 hour run time on full, 6 hour on half and 900 lumen output.

And for $200 it’s a pretty good bargain

Kenneth