I've mentioned this before - I bought 'low light' panels from Bimble, on asking what was 'low light' about them they explained that they were ex-Scandinavian panels and have been designed to pick up light at lower angles of incidence (not 'low light' levels - dusk or dawn etc) found in the higher latitudes and in 'our' latitudes during Winter.
I have no idea if this is achived by having the panels built at different (lower) angles or if it is some technology.
Certainly seem to have more output that standard panels did, but no longer have any 'old' panels to compare them to.
120 volt, 170 watt panels, this was a single 170w panel on a fine February day, batteries virtually full but still putting 3.3 amps (47 watts) in, and 10.8 amps (151 watts) in June