Old style H1 bulb

[Jumi]

I have this old style Philips H1 bulb and I was wondering that when did they end making these?

New style at right:

and bottom:

Was old model more shock resist?
What about lumen output?
Did that wire affect beam quality in low beams?

I'm quite sure that I took this bulb out of -86 Audi 90 (4000 in US)
high beams 5 years ago.

Juha

 

[-Virgil-]

The old-style H1 is made out of fused quartz. The new type is made of hard glass (it's now possible to make fused quartz H1 envelopes in the new style). The new type is better because the envelope is far more free of optical distortion, the filament can be made more compact and can be placed and orientated much more precisely, and there's no big shadow from the external ground return.

The H1 was introduced in 1962, and the changeover to the new style was pretty well complete by about 1975 or so.

 

[Jumi]

Thanks Scheinwerfermann

I knew that you would know.

It's strange that H1 bulb was redesigned so heavily.
Was H2 in 1964 without external groundwire?

Is there any site that has pics of old Halogen bulbs?

Juha

 

[-Virgil-]

It's strange that H1 bulb was redesigned so heavily.

Not really*—*the new design is much easier and less costly to make, and gives a better-performing product.

Was H2 in 1964 without external groundwire?

The H2 has always looked pretty much as it does now. There wouldn't be any need for an external ground wire, because the base has two metal "wings" side by side. One makes the positive contact, the other negative.

Is there any site that has pics of old Halogen bulbs?

You might poke around on http://www.lamptech.co.uk