Update with runtimes of SC65c HI on homepage.
High: H1 660Lm (PID, 2.8 hrs) or H2 437Lm (PID, 2.9 hrs)/ 244Lm (3.5 hrs)/ 157Lm (5.0 hrs)
vs SC64w HI
High: H1 1300 Lm (PID, 2.8 hrs) or H2 814 Lm (PID, 2.9 hrs)/467 Lm (PID, 3.2 hrs)/245 Lm (6.3 hrs)
I vote for SC64w HI.