After fruitlessly trying to find 100 watt bulbs with two toddlers in tow for several minutes, I gave up bought some cheap 60 watt incandescent bulbs and decided to figure it our later. When later came I learned the old 100 watt bulbs are no longer sold--hence my difficulty finding them. So, before I have to purchase bulbs again, I decided to figure this thing out. And then I thought to myself, there's a great math lesson in here somewhere!
Here's my 1st take at creating a lifetime cost lesson for light bulbs. The MS Word document is 3 pages: incandescent, LED, Compact Fluorescent (CFL). I'm probably going to include it in our system of equations unit.