Those numbers describe the power used by the two bulbs, in other words how many joules of electrical energy they use per second. The 100 watt bulb uses 40 watts more.
power difference
A light bulb, 40-100watts, cooks the food...slowly.
The difference is their wavelengths.
There is no difference.
Difference?? There is no relation.
You can go to sleep with the light on...
The main difference between light and x-rays is that x-rays are radiation.
The spelling of light.
what is the difference between plug ang socket?
You can unscrew a light bulb.
color
"Photo" means light, so the difference is that one zone has light and the other has no light. (The prefix "a" means "without")