Virtually no lead time, very bright, very pleasant color spectrum

Who maybe has experience with old / cheap energy-saving light bulbs in my head, which sometimes only after minutes received their luminosity and a number of seconds needed to them at all duties light, you will be surprised here. The lamp has virtually no start-up time, and lights up immediately after turning on light and in a very natural color spectrum. Who is accustomed to a warm white color spectrum, perhaps should not have access, but I personally love colder light spectra, and this lamp has a exactly in the most pleasant way.