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Progress Lighting Direct Mount Photo-Cell. Turns transformer on at dusk and off when ambient light appears. To be used with Progress Lighting plug-in low-voltage transformers. 1 3/8" Diameter, 3 3/4" Length.
Also referred to as "Maximum Overall Length" (MOL). For light bulbs, it measures the length of a light bulb, from the top of the bulb to the bottom of the base or pins and is typically expressed in inches. For light fixtures and ballasts, it applies to the total horizontal length of the item.
Light bulbs: a measurement of a bulb's width taken at the widest point of the bulb. Fixtures: the measurement across the widest point of a circular fixture.