ZD – As noted in my first post in this thread, the ?????? issue to which you refer is not a problem because the money is paid up front.
DY – You’re right, I momentarily forgot that Rav Moshe did not extend his opinion on timers to lights. However, if I remember correctly, this was not for any clear Halachic distinction; it was rather in deference to what had already become widespread practice. His reason for disallowing the use of timers was that it was included in the ???? of ?????.