I'd say less than 50$
I think a battery life of 2 hrs and 100 lumens would be ideal.
I wonder, is there a (lumens + time) rating, and extra weight given to lumens?
Something like 2(lumens) + (minutes).
For example, (a) 2(100 lumens) + (120 minutes) = 320 lumen-minutes.
(b) 2(80 lumens) + (240...