Traffic lights

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We are using 85 leds at 20 mA in 200mm traffic lights, 220Vac+/- 10% mains. Which driver do you think is better for this application?

If you need power factor, LYTSwitch devices would be the best solution. What is the output voltage?

The typical output voltages are:

 Red   : 2,2 x 85= 187 Vcc

Yellow: 2,0 x 85 = 170 Vcc

Green : 3.3 x 85 = 280 Vcc

All colors are 20 mA typical.

From your output voltage, seems like buck-boost is  a good solution. Pls check this example report using buck-boost topology and LinkSwitch-PH.

http://www.powerint.com/sites/default/files/PDFFiles/der298.pdf