Abstract: A fluorescent lamp that has a T10 outer diameter which is capable of operating on ballasts of both the T8 and T12 types. In addition to the T10 diameter, the lamp has at least one groove in its wall to reduce the envelope cross-section, a fill gas of neon and argon, preferably 25% neon and 75% argon and a controlled amount of mercury.
Abstract: A high intensity discharge lamp having an inner tube in which a discharge takes place to produce visible light and ultraviolet radiation and an outer envelope which blocks harmful ultraviolet radiation. An oxidizable element of a refractory metal is provided in the voltage supply to the arc tube internally of the outer envelope which element oxidizes when the outer envelope is broken and burns through to remove the voltage from the arc tube and to extinguish the arc.
Abstract: A high intensity discharge lamp having an inner tube in which a discharge takes place to produce visible light and ultraviolet radiation and an outer envelope which blocks harmful ultraviolet radiation. An element is provided to extinguish the discharge when the outer envelope is broken.
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