Works exactly as hoped - stays off in the daytime, comes on low at night (2 watts) until triggered, when comes on mch brighter (16W). Thresholds for ambient lighting, PIR sensitivity and high level duration after triggering all easily adjustable. The units were bought to replace old fittings that used incandescent bulbs, these were the only ones I could find with exactly the same functionality. Universal Lighting Services were a pleasure to deal with, easy ordering, very fast delivery and they clearly value their customers. An excellent all round experience.