system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How are LED Bulbs of different Brightness/ Wattage made ?
gpt
An LED works by making electrons give up a certain amount of energy when they cross the diode. That determines the wavelength of light that is emitted. Every electron that passes through means that a photon will be emitted. If you want more photons, you need more electrons, for more electrons you need more power (higher wattage). Now you can't just take an LED and force more power through it, or else you'll burn it out, so if you want to make one rated for a higher wattage, you need it to be built to allow more electrons through. It's like a pipe, if you build it to hold more water, more water can pass through it, but if you over fill it, it will burst.

A simple explanation, how "long" an LED is determines the color, and how wide it is determines the brightness.