
Originally Posted by
bsperka
Brian,
The glass handles the heat way better than the polycarbonate, which is a form of plastic. Before better lower watt bulbs were available, I used to run 100W in my old XB Falcon, with schneider glass replacement for Halogen bulbs. I wouldn't dream of doing this to any new car from 1980 onwards, as the heat buggers up the plastic pretty quickly. The problem that you talked about in your old Falcon (I'd say from the fact that you indicated it browned up that it is a model after 1980 or so - I think the XD was the first Falcon with poly lenses, but it may have been later? ), is the poly has been UV affected.
I understand that all poly lenses have a UV protection on them when made, but this fails over time and the plastic starts to get 'sun burnt', and starts to oxidise as well, hence the browning. Polishing removes the sunburn, but as there is no UV protection, it comes back. Meguirs plastix provides UV protection, as well as stripping away the sunburnt material - I apply it about every month or so when I'm washing the car. Takes about 3 to 5 minutes to do both lenses, including getting the product out of the cupboard.
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