This probably wasn’t in any Silicon Valley developer’s mind when they added an LED flash to a phone, but an LED flash on a cell phone works great to candle an egg. The case on my iPhone has a cutout for the flash which makes a perfect cradle to hold an egg. It almost makes me think that the designer of the case thought, “This size works perfect for candling eggs.” Maybe it was a designer who has a flock of chickens at home.
I discovered this by accident when I went to collect eggs after dark, and saw how well the flash on the iPhone lit up the eggs. I’m hardly the first to discover this, a quick search revealed many others who use their cell phones to candle eggs.