http://www.rallylights.com/hella/H4.asp
From what I can see only the 100% bulbs are coated purple.
The 30% and 50% bulbs have been out for a long time, I don't remember those being coated.
http://www.rallylights.com/hella/H4.asp
From what I can see only the 100% bulbs are coated purple.
The 30% and 50% bulbs have been out for a long time, I don't remember those being coated.