Originally Posted by
americanlt2
I currently have a Blackburn Mars 4.0 and a old Superflash. I'm not sure which to use or should I use both? The Mars 4.0 is brighter and I was thinking of putting it on solid red and superflash on flash?
I would say 'Yes' IF....you can still get on your bike without trouble, after having raised the seatpost and put the two lights on the seatpost.
I did that at one point, but started to experience pain in my hips from the raised seatpost accommodating two rear lights. So I had to go back to one. Now I have one flasher on the seatpost, on my back, and on my helmet.
Anyway, That was my experience.
If you can do, definitely do it.