We have seen manufacturers tend to exaggerate the lumens of their flashlights (DX and elsewhere). But do most exaggerations apply to just the higher lumens? For example I've seen reviews that said an 1600 lumen flashlight was actually only some 300 or 500 lumens. What I wonder is, if the manufacturer claims a light is 500 lumens, is it closer to the fact, instead of the light being actually 100 lumens? I'm getting frustrated because I paid nearly $30 for an "800 lumen" light, then saw another, "1800 lumen" light for less than $20. Should we trust the cost difference (more $$ = brighter?) rather than the lumen claim difference?

It is a known fact that they jack up the lums. However, I don't believe that are 90% off..
Example, my favorite light is the Keygos M10a.. That baby is rated at 1600 lums. Okay, I know that baby is pushing more than 1000, I know not 1600, I think, but it is over a 1000. For me, that is a good bang for the buck..
Also, would be nice for you to get both of those lights, I bet you will find out the answer then. My money would be on the cheapee to be the winner.