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Designing a LED fixture with LV AC input. The LED picked is 350ma 3.5V. There is a specification for high efficiency (;90%), minimum EMI, PF minimum of 0.7 (on any intensity), unit is to be dimmed for Medium intensity of 30% and Low to 10% by internal sensing of input (not linear dimming, example: input decrease 83% to produce 30% LED intensity and decrease to 72% input for 10% intensity), to be used in ambient temp of -40C to +55C. Need a recommended driver.