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Green bulb, red lens, orange flasher ?
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- Опубліковано 18 сер 2024
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Its brilliant, the light from the green bulbs cancels out the warm tone of the red lens making it a pinker red
In order for the combination of green light and red lens produce something like amber/orange, the spectral characteristics of each must be correct. The red lens cutoff wavelength must be not too far into the red, meaning it must pass some amount of orange or yellow-orange light. This would mean the red lens cannot be pure red, but must have some discernible 'orange-ish' hue already.
And the green light must emit a certain amount of orange, but at the same time with essentially no emission of red. That could be hard to find where dyed filtering materials are used for the light. Anyway, such a light by itself must be more yellow-green than blue-green.
If these conditions are met, the overlap between the red lens short wavelength cutoff and the green light's long wavelength cutoff results in what is a bandpass filter. But the light intensity will be rather weak, especially if the resultant peak transmission intensity is much less than peak emission of the light by itself.
In actuality, for this to be reasonably efficient, both light and lens must have a pretty sharp cutoff, where the zone between min and max filtering is rather narrow in wavelength. Dyed materials tend to have too-gradual cutoff. Dichroic filters comprised of many layers doing the interference would be the way to go. But this would be silly because it's FAR more expensive! And they work only under very stringent conditions of angle of passage of light through the filter, making this approach in auto indicators most impractical out of the gate.
The moral of the story? Only under the right circumstances can a green light and red lens employing dyed materials produce a sorta kinda 'amber', and even then it will be weak in intensity and likely of less than desirable color purity.
Cheers!
Thanks Glenn, as you may have gathered it was more of a fun reply video to a question posed in a club forum than a serious science experiment. But I thought it was worth publishing anyway :)
could you do an amber bulb with red lense?
Got that setup in now, one of the issues is I'm using original 60's lenses, and by today's standards they are really thick red plastic. I suspect a cheap thin lens would work.
I just did that today, a slight difference from the clear bulb behind red lense that it originally was
default turn signal bulb (7440) for my car is clear incandescent behind red lens.
a video showing amber behind red lens looked amber
got both Sylvania regular and silver star (brighter) but for me it just looked lighter shade of red, returned to store
couldnt find a green 7440 incandescent bulb but found 7443 (still fits)
my results for a 7443 green bulb behind red lens, it does have an yellow/amber appearance
incandescent 600LM brightness: dim at night, useless in the day time
(had to add load resister for LED to stop hyperflash)
LED #1 1400LM brightness: twice as bright as incandescent but not as bright as other lights, but dim at day
LED #2 2500LM brightness: ordered yesterday, waiting for it in the mail, ill update on the results