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updraught · 07-02-2020, 07:56 AM

"During the mid and later 1800s virtually all American glass companies were using manganese in their glass formula. Around 1915 the use of manganese was discontinued and selenium became the chemical of choice as a clarifying & stabilizing agent."
https://patternglass.com/sunPurple/index.htm

The old lenses here in Oz have a yellow tint (Canadian?). The new repo are clear and lighter, with less flute definition.

Something I've noticed over the years with sealed beam/quartz headlights, between good headlights that used a crystal lense such as the French Marchal (now owned by Cibie), and cheap Indian glass lenses (with not much flute definition) is that for a headlight it didn't make much difference.
French Model A's used Marchal headlights for local content. Marchal later was a sponsor of the Le Mans 24 hour race.

However, for driving lights the Marchal lense and reflector produced a near perfect beam. The Marchal 902 rally light pictured here produces a perfect pencil beam that seems to go for miles, and the 909 a good spread over a long distance.
https://www.bmw2002faq.com/articles....for-bmws-r248/
These days I use a $300 22,000 lumen light bar from ebay for kangaroos.

07-02-2020, 07:56 AM	#9
updraught Senior Member Join Date: Feb 2015 Location: Australia Posts: 1,971	Re: Original headlights "During the mid and later 1800s virtually all American glass companies were using manganese in their glass formula. Around 1915 the use of manganese was discontinued and selenium became the chemical of choice as a clarifying & stabilizing agent." https://patternglass.com/sunPurple/index.htm The old lenses here in Oz have a yellow tint (Canadian?). The new repo are clear and lighter, with less flute definition. Something I've noticed over the years with sealed beam/quartz headlights, between good headlights that used a crystal lense such as the French Marchal (now owned by Cibie), and cheap Indian glass lenses (with not much flute definition) is that for a headlight it didn't make much difference. French Model A's used Marchal headlights for local content. Marchal later was a sponsor of the Le Mans 24 hour race. However, for driving lights the Marchal lense and reflector produced a near perfect beam. The Marchal 902 rally light pictured here produces a perfect pencil beam that seems to go for miles, and the 909 a good spread over a long distance. https://www.bmw2002faq.com/articles....for-bmws-r248/ These days I use a $300 22,000 lumen light bar from ebay for kangaroos.