My team is using a Limelight 2 and due to the recent “Limelights being ruled illegal” post and Q&A 106, we are going to be turning off our lights when not actively targeting. My team is telling me that there is a “warm-up” period for the lights but I can’t find anything in the Limelight documentation or Chief Delphi about a warm-up period and LEDs by definition are not supposed to have a warm-up period. Also, one of the new features of the Limelight 2+ is that there is no “warm-up” period but it provides no more detail than that. Does anyone have any additional information?
They’re pretty darn instant on/off from what I can tell.
It can take ~20 seconds after turning on the robot for the limelight LEDs to turn on, but once it’s on changing the LED state is instant.
The “warm-up” period is the time period when you power on the robot and the lights flash.
You shouldn’t have a problem about this when aiming to shoot, as others said, the lights turning on and off after “warm-up” will be instant.
LEDs don’t generate light as a result of being hot enough to radiate visible light, but on a voltage step directly kicking electrons into energy states that are a few electron volts above their base state (green is nominally 2.3eV). From this state they spontaneously drop back down, each emitting a photon. The time to essentially full intensity is way smaller than human perception, my guess is that it’s on the order of a microsecond.
Thanks for the info. That all lines up with what I thought. I finally got my team to test this today and there was no impact to the robot performance when we turned on the LEDs right before searching for the target.
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