The OP announced a total budget of
$35 and I rolled my eyes. But hoodibaba! The headlight in post #5 combined the taillight in post #14 will only be about three or four bucks over that after shipping. The set is no Nabendynamo-driven Luxos U and Toplight Line, but it's bright enough to see by and been seen by any driver that's not drunk or texting. Color me impressed.