The full output is after power, like all LEDs, available immediately. The light is very bright in the small hallway above. A "spot" effect is hardly noticeable, with skillful alignment of the lamps I could reach a relatively uniform illumination. Many like the cold as perceived, rather bluish LED light not - at this lamp 2700 Kelvin are promised, what is usually described as pleasant. I have no measuring device, but in direct comparison to the very favorable 2700 K IKEA E27 LED light is not quite as hot - but still pleasant.
Overall, the lamp would have earned 5 stars, light and design are really very good. A star, I prefer the effect that you can not change the individual lamps; a development that was to be observed in LEDs, but not too hot is.