The problem with the old lenes, is there cut wrong. Back in the 30's your weren't going that fast on dirt roads, and the lenes cut to through out the light. not aim the light, like it is with todays lighting. If you put sealed beams back behind the original lenes the double glass defuses the light.
With today's after market products you would think somebody would make new glass for the old headlights. So the glass could aim the light down the road instead of throughing the light.