I have the lamp now always overnight and can far actually festellen only positives: The plants grow nicely compact and have a healthy green. Because the lamp directly with me shines from above, the plants grow now and not only toward the window.
However, one should be aware of when buying that you can irradiate only a limited number of plants with a lamp because the lamp with its 12 watts has not so much power and light up only in one direction.
For lamp itself: It works flawlessly, significant heat generation, I could not find and that it shines in purple bother, I think, no - you quickly get used to it.
So I can recommend wholeheartedly lamp.