It depends what you want a light for. It's much like people who hang 50 lights off of themselves and their bikes. Above a certain amount of lights / brightness you are not gaining anything in being seen. You are seen.
It's a bit like speaking to someone. At very low levels people will be straining to hear you then as you volume increases they begin to hear you clearly. As long as some is hearing you clearly without issue from a comfortable distance there is no point shouting. If you continue to increase your volume of speaking then you just become annoying / painful and although they can hear that you are shouting so concentrating on what is being said becomes very difficult because of the pain / overwhelmingness of it all.
I think that happens with overly bright rear lights, you get to the point where people are passing you but they have to go for a bit of a blind drive as they pass and wait for their eye to adjust. It becomes a drive and hope it's clear situation. 99% of the time it's ok but then it's not clear that one time.
It depends what you want a light for. It's much like people who hang 50 lights off of themselves and their bikes. Above a certain amount of lights / brightness you are not gaining anything in being seen. You are seen.
It's a bit like speaking to someone. At very low levels people will be straining to hear you then as you volume increases they begin to hear you clearly. As long as some is hearing you clearly without issue from a comfortable distance there is no point shouting. If you continue to increase your volume of speaking then you just become annoying / painful and although they can hear that you are shouting so concentrating on what is being said becomes very difficult because of the pain / overwhelmingness of it all.
I think that happens with overly bright rear lights, you get to the point where people are passing you but they have to go for a bit of a blind drive as they pass and wait for their eye to adjust. It becomes a drive and hope it's clear situation. 99% of the time it's ok but then it's not clear that one time.