Deep-Dimming Fluorescent Ballasts

THE PRODUCT:

Deep dimming fluorescent ballasts allow lamps to be dimmed below 50% of output. They apply to ballasts that operate T5 and T8 four-foot linear and u-shape fluorescent lamps

THE STANDARD:

Though there are national standards for dimming fluorescent ballasts, there are none for deep-dimming fluorescent ballasts. In 2015, the California Energy Commission (CEC) adopted the following standards for deep-dimming fluorescent ballasts:

(1)   Shall not consume more than 1 watt in standby mode;
(2)   Shall have a power factor of 0.9 or greater; and
(3)   Shall have a weighted ballast luminous efficacy greater than or equal to the threshold described in the following equation:

ballast efficiency formula

CEC also modified the national test procedure by adding criteria with which to test ballasts dimmed more than 50%.

The CEC standards are effective July 1, 2016.

KEY FACTS:

CEC estimates lifetime savings of $22 per ballast over the 13-year lifetime. In California, the net present value is estimated at $38 million the first year and $505 million per year once the stock turns over.

Projected Savings

Timeline

Federal Date States
2016 CA Standard Effective
2015 CA Standard Adopted

Timeline reflects state standards from 2001 to present; federal standards from inception to present.