Legacy B4 bulbs

B4 soon

Petrolheads
Just wondering if all B4s use double contact double filament sidelight bulbs? Ive only just noticed that when I indicate in either direction the side light on that side gets brighter-i assume to light up the turns apex-as in new citroens. This would explain why a double filament bulb is used. Or is it an electrical fault?
 
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