cypressfalls_Robert wrote:could the light source of the photoresistor circuit mentioned above consist of a laser by any chance?
http://soinc.org/lasers wrote:All lasers are required to have a safety label stating the class they fall under. Lasers missing the required label will not be permitted. Due to the difficulty of verifying power output, only commercially assembled laser devices may be used.
(actual label may vary)
Class 1, 2 & some Class 3a lasers are labeled with a "Caution" and the possibility for injury is minimal. They can be allowed without question provided contestants avoid indiscriminate exposure to other contestants, judges or spectators. Careless/indiscriminate use may be grounds for disqualification.
(actual label may vary)
Some Class 3a & all Class 3b lasers are labeled with a "Warning" and there is a definite, though small, possibility for eye injury. These are allowed if they are mounted in a fixed position on a stationary device.
They may not be used on mobile devices such as robots and vehicles. Contestants must take fail-safe precautions to eliminate the possibility of accidental exposure to the eyes of judges, spectators, contestants and other people in the room. Shielding must be provided to insure the laser beam cannot exit the boundaries of the device. Accidental eye exposure is proof that proper precautions have not been taken and the team must be disqualified if it occurs.
The implication is that lasers with a "Caution" label may be used anywhere, as long as precautions are taken to prevent eye exposure. Any eye exposure, even accidental, is proof of careless/indiscriminate use and contestants may be disqualified if it occurs.
Lasers with a "Danger" label may not be used on mobile devices, but they may be used on fixed devices such as with Mission Possible. The laser beam must not be allowed to exit the boundaries of the device. Any eye exposure must result in disqualification.
Bear in mind that all laser devices also contain other electronic components such as transistors and integrated circuits to control the current to the laser diode. If these electronic components are prohibited, the laser would violate the rules.
As always, the only way to be sure is to pose the question to the judges of the tournament you will be competing in.