Isn't the contact shape thing just an issue with the 1157 or P21/5W style bulbs though? The single contact bases look similar, or are there dimensional differences that aren't obvious? Is the rise time thing due to the higher current draw/heavier filament of the 1156? (i.e. would the same statement hold true for the older 1034/whatever the single filament equivalent would be series?) What material are they using for the sockets, anyway, that is incompatible with brass base bulbs? Seems like American cars, with all their faults, are a lot more tolerant electrically, pretty much any bulb will fit and work at least until the sockets start to rust (and I do say rust, as they are almost always stamped steel)
I have never seen one of these, are these a Krypton-filled bulb like a
1156LL? Where are they sold?
Would this also be an acceptable replacement for an 1156, or only a P21W? I go both ways when it comes to cars... :)
thanks...
nate