So....why do you take the rare exception + use it to be proof of point? It isn't the one bulb in 20 that caused LEDs or CFLs to lag. Its the large percentage of people who refused to replace ANY bulbs because they haven't done the math which reveals how superior they actual are to Edison bulbs.

As for flashlights, my experience with the old C + D cell incandescents is they tended to corrode when allowed to sit unused for long periods. The best and cheapest flashlight I've ever purchased was also the most expensive. It is a solar powered LED flashlight with rechargeable batteries. It cost nearly $40.00 more than 10 years ago. It is always charged + I use it at least 20 times per year. The bulb never burns out + I've replaced its batteries only one time. Had it been an old flashlight, I would have needed new batteries every year at a minimum and they, alone, would have cost more than my LED flashlight cost new, the bulb would have burned out as well and it likely would have corroded.