This patent is for one of the first high-intensity discharge lamps.

Intensity control was provided via a mechanical shutter (the discharge lamp being non-dimmable).

With some discharge lamps, very high voltage is used to strike the arc.

Under certain conditions, the accumulated charge (and hence the potential difference) is sufficient to trigger a discharge lamp.

As waste energy is limited by the thermal lens this means higher power densities compared to high-intensity discharge lamps.

These lamps are a form of discharge lamp where a small current causes a gas in the tube to glow.

A strong light source, often a high-intensity discharge lamp with a high colour temperature.

High-intensity discharge lamps are a type of arc lamp.

At the end of life, many types of high-intensity discharge lamps exhibit a phenomenon known as cycling.

The gas discharge lamps we had were few, but they were powerful.