Have the bulbs (2 pieces) now since the weekend in the bathroom. Small room with almost no natural light. The lights are bright and without delay at full luminosity. They are brighter than 25 watts of energy-saving lamps. The light is white and warm. So does not act like in a theater. Den, greenish, described by other buyers, I can not determine from the outset. I can logically say nothing about the long-term use or the specified switching interval. But the first impression is more than positive and for the price I can only say: strong buy recommendation.