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What is Base Down

Horace He

Last Updated: December 26, 2023

What is Base Down

Base down is a term that describes the orientation of a lighting fixture or bulb. When a fixture or bulb is positioned with the base facing downwards, it is referred to as “Base Down.” This orientation is commonly used in applications where the light needs to be directed downwards, such as in recessed lighting or outdoor fixtures.

By positioning the base down, the light emitted from the fixture is focused in a downward direction, providing targeted illumination to specific areas. This orientation is often preferred in situations where task lighting or accent lighting is required, as it helps to minimize glare and create a more focused and controlled lighting effect.

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It is important to note that the term “Base Down” is not limited to a specific type of lighting fixture or bulb base. It can be applied to various types of bases, including screw bases, twist and lock bases, bayonet bases, and others. The key defining factor is the orientation of the base, which determines the direction of the light output.

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Frequently Asked Questions

What Is Base in and Base Out

The term “base” refers to the thickest edge of the prism, indicating the direction in which the light is redirected. This can be either on the outer edge of the lens (Base Out, BO), the inner edge (Base In, BI), or at the top (Base Up, BU) or bottom edge (Base Down, BD).

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