I tried comparing an older 160 lumen flashlight to a newer 320 lumen flashlight indoors several months ago. I really couldn't tell that much difference in brightness and ended up being disappointed with the 320 lumen light. Several weeks later I went camping and tried the comparison again. The difference in brightness outdoors was stunning. I recently purchased a 530 lumen light for camping, hunting etc. When you're out in the middle of nowhere at night, those extra lumens are very helpful. For indoor purposes, a strobe function is best for disorienting an intruder.
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