Thanks for this.

I hadn't come upon this thread until today; makes for interesting and informative reading. I don't ride after dusk though so my white bike (one from PlanetBike) headlight I've typically run on a patterned strobe setting but with what I'm reading here that's going to change. My rear TREK CarBack radar's light flashes red, my helmet-mounted PlanetBike red is set for steady.

No one has ever commented on what they're seeing as we encounter one another during our rides so what I'm reading here serves as a good idea of what's a Best Practice protocol.

BTW as for 'color temperature': Wasn't a big deal until the advent of photography when color film was created and transparency film was King. Different slide films were designed to yield 'normal' looking whites when exposed under lighting that closely matched the formulations of the dyes used in their engineering. Use the wrong film for the prevailing lighting produced either orange-ish or blue-ish results upon processing.

In more common practice now, white light is perceived by humans across a range of Kelvin temperature levels according to the circumstances of their viewing it. 2,700°K is a Warm White, roughly comparable to the tungsten filament electric lamps prior to the advent of LED's. 3,400°K is uncommon but still 'artificial' in nature. "Cool" white can be anywhere from 4,000° to 5,200°K while 'daylight' is often 6,000°K or greater. The higher the number the 'bluer' the resulting light when illuminating a white object.

There are LED lamps (bulbs if you wish) now that have selectable color temperature settings. The user has only to slide a small switch on the lamp (or in an app on their smartphone) to adjust the lamp's 'white point' to a higher or lower temperature.

The human eye / brain 'organ' is remarkably adaptable in its ability to adjust perception according to circumstances, why we often don't perceive a change in illumination unless there's something wrong about it to give us an idea of what's not quite right about what we're seeing.