LED lighting system for use in environments with high magnetic fields or that require low EMI emissions

An electromagnetically shielded light fixture for use in a shielded room, the fixture comprising:

• a frame;
• a reflector;
• a light emitting diode (“LED”) light source positioned within the shielded room and including a printed circuit board (“PCB”) and one or more LEDs;
• and
• a control circuit positioned outside of the shielded room and configured to receive power from an alternating current (“AC”) power source and to provide a regulated operational current to the LED light source,
• wherein the operational current provided to the LED light source has a triangular wave shape.

A light fixture for use in an electromagnetically shielded room, the fixture comprising:

• a light emitting diode (“LED”) light source positioned within the shielded room and including one or more LEDs;
• and
• a control circuit positioned outside of the shielded room and configured to receive power from a power source and to provide a regulated operational current to the LED light source,
• wherein the control circuit includes at least one transistor configured to interrupt the flow of current through the control circuit, the transistor having a first state and a second state,
• wherein the control circuit includes an inductor operable in a first polarity to limit the rate of operational current increase and operable in a second polarity to limit the rate of operational current decrease,
• wherein the operational current provided to the LED light source is increased and decreased in a linear manner based on the state of the at least one transistor and the polarity of the inductor, and
• wherein the light fixture is non-ferrous.