慳電慳膽

某天在巴士上無意中聽到某節目(大意): 不要常常開關慳電膽, 否則個慳電膽可能會得番60%壽命.

huhhh? 是什麼邏輯?

即是, 舉個例: 雖然閣下只是洗澡半句鐘, 但係為咗個慳電膽長(正常)壽啲, 沖完涼都唔好熄燈, 由佢開住stand-by.
Well, 個'膽'stand-by成晚, 唔使多, 3個鐘好未, 就係為咗服侍梳梳洗洗大大小小加加埋埋嗰1個鐘 - 即係用2/3 嘅 idled life 買40%膽命(in which 2/3 is probably idled too)...

條數應該點計呢?