Per Q&A #350, you are allowed to use additional 12V > 5V Converters on the robot for powering custom circuits:
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Originally Posted by FRC Q&A #350
Q. In response to our previous question, can we use an additional 12VDC-to-5VDC converter for a custom circuit on one of the 30 amp load terminals on the Power Distrobution Board?
A. There are no rules prohibiting this.
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The 5V Converter should allow you to use a bunch of different COTS flashlights without too much trouble, although the light output may vary a bit depending on what the flashlight is intended to be run on, and you could have issues with shortened life span if 5V is significantly higher or lower than what is ideal.
That being said, if you're just looking for a
reasonably bright light that will work with the robot without too much hassle, you can very easily find a 'Driving Light' or 'Work Light' made to be used with Automotive 12V Systems. Power this through a Spike Relay and you've got an easy light with on/off control.