system
Given the following post, respond as if you're commenting on Reddit:
human
Why are all LEDs roughly the same size? Could they be made much larger? What about much smaller?
gpt
LEDs do come in different sizes. From the surface mounted ones used in old mobile phones, to the 3, 5 and 10mm ones you buy in electronics stores (these are the most common) to larger things like the luxeon star LEDs used in lighting.



Just consider it is more efficient and better for managing heat to have lots of smaller LEDs than one big one so manufacturers tend to stick to the mass producible sizes like 5mm, so lots of things have those.