Quoted: Could it be possible that he was signaling that it was clear to pass?
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Rules of the road states it is never legal to flash your brights at an oncoming vehicle.
You can flash them on and off, but even that is illegal to signal "clear to pass", as that
is "directing traffic".
I believe standard headlights are 45 watt low, 55 watt high.
I've seen some standard bulbs go up to 65 watt.
You can buy aftermarket replacement bulbs up to 100 watt,
and for H4, even up to 140 watt.
(really nice if you are driving in the country at night)
Old 4-headlight GM vehicles (like my '69 Chevelle) had metal dishes the
headlights would fit in. With very little modifications, KC Daylighter bulbs
will fit. My dad's '65 Impala currently has 12.0V aircraft landing lights.
They are a tad brighter, as they are being overdriven on a 13.8v system.