Originally Posted by
OldTryGuy
I can't address the 500 since I have the 650 and feel it is fantastic. Low at 200 lumens is great for street riding at 17mph and the 650 lumens is awesome.
NiteRiderLumina 650 - NiteRider
click on comparison chart for the lumen output. 500 medium would be 250 lumens that I think would be OK for 15mph
+1
I also have the Lumina 650. Low works for me on unlit residential streets (though I also have a helmet-mounted light running on low so I can "see around corners"). Nice to have the higher settings when I get into busy traffic. Also, NR customer service has been very good; when I had a problem with it last year they told me to just send it in, no receipt or proof of purchase date, etc.