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re: "...but have a single round headlight on my motorcycle. The light output doesn't seem nearly as clearly defined as the rectangular lamps...."
As someone who used to use Cibie (e-code) 7 inch rounds on his '73 and '75 164's, I'd suggest putting just one of these on your bike (www.danielsternlighting.com).
As I pointed out in my other post, a round lamp far surpasses anything a rectangular lamp will do simply because of the reduced reflector area of the latter; and Bosch points out in their book that larger diameter lamps (e.g., 7 inch) are more efficient than smaller (e.g., 5.5" quads) lamps. Even with a normal (55/60) wattage H4 inside, it will far surpass even your 240's quad rectangulars (which I presume are mere sealed beams).
In low beam, you'll have excellent pavement coverage as well as a rising illuminating on the right (to show deer or other wildlife that would otherwise become roadkill), all without blinding oncoming drivers; and in high beam, it will turn night into day compared to your sealed-beam quads.
Of course, if you choose to change both your bike and car's quads to Cibies, then the quads will win: 4 beats 1, even if the 4's are rectangular :-).
Regards,
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