I'd hardly use the term "eye frying output" for 60/55w H4 bulb headlights. With good reflectors and lenses, one drive at 70 mph safely, but I would regard sealed beams as only good for 55 or 60 at a pinch. That was the reason I first used Quadoptics in about 1981.
My headlights only have 35/35w scooter bulbs fitted (cheaper and easier to get than the H4 standard, but are easily converted with a pair of tinsnips). Before anyone goes "yuck, how dim" they are actually far brighter than the wattage would suggest and much brighter than original headlights anyway.
Smaller side light bulbs are quite easy to get in both 9 and 15mm diameter fittings and my pre-war rear lights take 15mm bulbs. I rather suspect someone fitted more modern holders to enable this, but the basic bulbholders are quite easy to get, and being brass, dead easy to further modify with bits of brass sheet and a soldering iron.
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