Sunlight

“54% of sunlight is near infrared radiation.”

“Everywhere pretty much that people live has enough sun that you can make, you know, can grow enough food to survive. And if you can grow enough food to survive, you can synthesize enough fuel to run your modern industrial economy.”

“The actual lumens, it's a measurement of light that's being produced by these guys, is like a minuscule fraction of what you would get even on a cloudy day in the sun.”