having used LED strips, ive found theyre great in low light (or at night), but completely useless in bright sunlight.
now that im getting parts together for a new custom frame, im going to try some seriously big LEDs giving a single point of light at the end of each arm. these are favourite so far: http://www.ebay.es/itm/130702285270 as they are rated for a 12V socket i assume they have a resistor in series with the LED inside that case, but i will test them before wiring everything up.
the thing is though, just as the small LEDs in strips are pretty much invisible in full sunlight, im sure that these will be _complete_and_utter_overkill_ at night - that ill have people calling the police because theyve seen a UFO etc.. ideally i would like to be able to regulate the brightness all the way from full power to a faint glow.
reading a little about voltage regulation it seems that it can be incredibly wasteful trying to do this with a simple cicuit, and so i really need a switching BEC to power them at the lower voltage. if it turns out that the brightness at 5V or 6V is just right for flying at night then thats no problem, i can plug the lighting circuit into a tiny switching BEC and all is good. but i wonder if i might want even less power to the LEDs, and ideally it would be nice to be able to be able to select brightness all the way from 1V to 12V.
so my questions:
- does anybody know of a cheap, lightweight voltage regulator with a wide range of adjustable output?
- if 5V is just the right voltage, and i want to use the BEC currently supplying APM, could the change in load with LEDs blinking disrupt the voltage supplied to APM? - assuming 200mA of current to the LEDs
- is there anything else to consider here?