This is a box full of never used 100 watt incandescent light bulbs. Years ago, I raised chickens and I would use these for light and heat in my chicken coop hen house and the brooder. I found that by keeping a light on, the egg production would increase in the winter and the waterer wouldn't freeze. The incandescent light bulbs provided heat to the chickens and peeps during cold winter months. I stockpiled a bunch of these light bulbs before they became outlawed to produce and stores to sell. 15 hours of light to the chickens equates to 1 egg each.