...
When a single LED was removed, the remaining LEDs were fully illuminated at approximately 3V. Constant current mode was activated on the power supply. Supplied current was 250mA.
Brightness
Red lights:
Brightness was measured in a dark room with a photometer. Potentiometer was set to its maximum. Brightness was measured to be 280 lux from about 30cm away. This works out to be 25.2 candela, which is not bright enough for the tail lights (requires 60 cd).The LEDs were driven directly at 12V, without the driver (they burnt out in an accident, guess who did it)
This website was used to convert from lux to candela:
https://www.rapidtables.com/calc/light/lux-to-candela-calculator.html
Amber reference lights:
60 lux from 1 foot = 5.6 cd
the ruler that was used was slightly reflective.
Red lights:
12 V * 0.21 A = 2.52 W
850 lux from 1 foot = 78.9 cd
This circuit included the zener diodes used for protection.
the ruler that was used was slightly reflective.
White lights: