Product Code Database
A wheat lamp is a type of incandescent light designed for use in underground mining, named for inventor Grant Wheat and manufactured by Koehler Lighting Products in Wilkes-Barre, Pennsylvania, United States, a region known for extensive mining activity. Erin Ann Thomas, Coal in Our Veins: A Personal Journey, University Press of Colorado, 2013, . Chapter 23, first page.
A safety lamp designed for use in potentially hazardous atmospheres such as firedamp and coal dust, the lamp is mounted on the front of the miner's helmet and powered by a wet cell battery worn on the miner's belt. The average wheat lamp uses a three to five watt bulb which will typically operate for five to 16 hours depending on the amp-hour capacity of the battery and the electric current of the bulb being used.L. C. Isley, A. B. Hooker, Permissible Electric Mine Lamps, US Department of Commerce Bulletin No. 332, 1930, pp. 32-34
A grain-of-wheat lamp is an unrelated, very small light bulb used in medical and optical instruments, as well as for illuminating miniature railroad and similar models.
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