What is CFM?

A unit of wavelength equal to one billionth of a meter

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Seasonal affective disorder (or SAD) is a form of depression caused by the lack of sunlight. It usually occurs in winter when natural light levels decrease. A common treatment for this condition is phototherapy, in which a light box is used to expose the patient to high levels of light for prolonged periods. Because of the high level of light used and the risk of eye damage due to ultraviolet radiation exposure, people who may be suffering from SAD should consult a health professional, wh...

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What is the Hot Restart Time?  The time it takes for a High Intensity Discharge lamp to reach 90% of the light output after going from on to off and then back on.

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The proper term, High Efficiency (Energy Saving) Electromagnetic Ballast, is a ballast with a core & coils, designed to minimize ballast losses compared to the "standard" ballast.

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What is Static Pressure Static pressure is a measure of the resistance against airflow as the fan pushes air through a duct. It is measured in inches of water column or water gauge, such as 0.25" w.g. to show that resistance is equal to a column of water gauge. It is expressed as 0.1" w.g. or 0.25" w.g. to show that the resistance is equal to a column of water one-tenth or one-quarter of an inch tall.

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