T/A sealed beam reflectors

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roads and like

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The optics are different. The pattern is different, and why would you mod a useless sealed beam insted of just getting a proper replaceable lamp headlamp system, Bosch, Cibie, or Hella (or whatever).

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roads and like

difference between the

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concerned about

The T/A sealed beam housings; H4701/H4703 are an odd size; 3 1/2" X 6". The conversions for them are damn few and far between. Here's Eurolights for a single pair; one of the few I've seen;

I opened the back of a Sylvania H4703, cut off the high temp silicone seal, and there was a halogen bulb screwed in. The base/mount was identical to an H3 bulb. H3's are mighty small bulbs but they'll go bland vanilla filament up to 100 watts.

The only modding involved is with a razor blade, a screwdriver, and replacement silicone. That gives me a higher output bulb in the same size hard to find housing. Total outlay is for 4 H3 bulbs 4 crimp on terminals and sealant. And if I ever decide to go HID, I just get an H3 kit which reuses the bulb housing. I suppose I could do a dremel mod to fit a larger filament bulb in some time but with the exception of the ground wire, the H3's are identical basewise to the halogen base already in the sealed beam. The depth of the bulb is also the same keeping it in the focus of the parabolic sealed beam reflector. I don't call that useless.

I suspect Sylvania didn't want a separate tooling for sealed beams that size. If they need 1000 4701 sealed beams, they pull 1000 H3 housings and seal the halogen bulbs in them.

I take it then that your position is that the lens and perhaps reflector are specific to the high or low beam application?

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Yes, the 4701 and 4703 will have different lens patterns. Given the construction of those particular sealed beam units, I quess it might make sense to "rebuild" them, since it APPEARS they are constructed using H3 lamps (meaning you have a fighting chance of getting the filament installed in the correct position).