Abstract: A retrofit assembly and kit provide for the retrofitting of a low-frequency T12 fluorescent light fixture with a magnetic ballast with high-efficiency high-frequency T5 fluorescent bulbs. Since the lumen output of the T5 retrofit lamp is greater than that of the equivalent T12 bulb, and typically more than desired, there is provided a dummy bulb which bridges one pair of terminals without being active as a lighting unit. The delamping link dummy bulb is provided with a bank of series-connected capacitors connected between the power pins of the pair of terminals. The dummy link may also be used to replace a T12 bulb where the lumen output of the fixture is more than desired.

Abstract: A circuit configuration for powering high-frequency fluorescent lamps with rapid start capability has input terminals connected to a ballast and output terminals connected to a fluorescent lamp. A transformer module has at least one primary winding that receives a power signal from the ballast and two or more secondary windings that are magnetically coupled to the primary winding. The secondary windings power the cathodes of the fluorescent lamp. The energizing signals are at a high frequency for powering high-frequency fluorescent lamps with rapid start capability. Tuning capacitors are used for tuning the high-frequency power signals. A control device, for instance for occupancy sensing and/or daylight harvesting may be connected into the circuit so as to further raise the efficiency of the luminaire by only energizing the lamp when it is useful.

Abstract: An adapter for a T12 fluorescent light fixture that is used to convert the fixture into a T5 or T8 fixture. The adapter includes a male input for receiving power supplied by the T12 ballast. The adapter has circuitry that adjusts the power supplied by the T12 ballast to parameters usable by a T5 or T8 fluorescent lamp. Also, the adapter includes a female output for outputting the usable power from the circuitry. The usable power drives the T5 or T8 fluorescent lamp.