Don't mean to be a wiseass but if you look at DRL when you're eyes or camera are adjusted to 'bright' it may not blind - if they aren't as the night is dark then they will blind you temporarily.
Try with a camera in manual settings (auto settings will adapt which your eyes won't quickly enough unless you've been looking at lights for 2-3 secs nds) open the aperture wide and set the shutter time so that the headlights (dipped beam from inside car) look as bright as they would if you're driving.
Now go outside and use a tripod set up to height where normally a driver's pair of eyes are at a few meters to say 50m away, offset so you're on the right of the car. With the same manual camera settings now take an image and look at the brightness with standard 26% and then 100%.
On a different note; not getting flashed by other road users doesn't really mean sh!t as a measure of how blinding your headlights are.

I'm just wanting to discuss so don't take above too seriously. DRLs on 100% will probably still blind less than the idiots who drive round with misadjusted lights, HID bulbs in halogen headlights etc. I just see a lot if idiots on the roads due to my high annual mileage.... suppose that makes me a little sensitive
