Any way, why would you want both on. The lows are not bright enough to make a difference with the highs on. If your brights are on and then you turn your lows on, I'll bet you won't see one bit of difference. The fogs on the other hand, you'll see a noticable difference especially with the glare gaurd removed.
Scott Meyer ***1993 Blue Pearl Graphite NA*** Non-Aspirated ***1981 Sweet Blonde Pearl N/A*** Not Available