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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“Nature and nature’s laws lay hid in the night. God said, Let Newton be! and all was light!”
—Alexander Pope (1688–1744)
“I hid my love when young till I
Couldn’t bear the buzzing of a fly;
I hid my life to my despite
Till I could not bear to look at light:
I dare not gaze upon her face
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Where’er I saw a wild flower lie
I kissed and bade my love good-bye.”
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—Margaret Fuller (1810–1850)