If you’re shopping for a flashlight, you may think looking at how many lumens it puts out is the best way to determine quality or usefulness. It’s an understandable assumption, but that number in ...

One of the most common specs used to compare projectors is a measure of how bright each model is: lumens. This is because, in theory, a 1,000-lumen projector will be brighter than a 500-lumen ...