HID
ETC also manufactures an HID (high-intensity discharge) Source Four with a metal-halide lamp. The fixture has a ballast attached to the yoke of the fixture which provides the added power required to strike and operate an HID lamp. HID lamps are not dimmable. The HID fixture uses less energy than the standard HPL lamp.
Read more about this topic: Source Four
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—William Shakespeare (1564–1616)
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