Design considerations for a low cost and efficient Light Emitting Diode (LED) luminaries involve numerous compromises. Factors such as efficiency, power factor and flicker Index all present a compromise against each other. It is conventional to employ suitable means that make for a low cost and efficient LED luminaire. In this paper, a driverless AC-Direct LED luminaire with non-perceptible flicker, improved power factor, with acceptable total harmonic distortion (THD) characteristics is designed. With a flicker index of 0.2, it outperforms most AC luminaires employing high voltage switching chips, which have a typical flicker index usually greater than 0.3. The efficiency is 88%, as against 80% achieved by most AC LED light engines. The design has a THD of 18.79% and power factor of 0.92, this meets Energy Star requirements for consumer products.

Keywords : LED Luminaire, Flickerless LED, Driverless, Low Cost, AC-Direct.