I had ordered the item just for fun for his time 2.99 euros and relatively little expected of them. When I screwed the light effect in the E27 socket in the living room and the light switch operated, struck me really down his jaw. I did not think that I get to see such a nice effect for the price. The colors red, green and blue rotate through the prism slightly offset from one another at a constant speed, which forms a very pleasant flowing effect. The number of points of light that are generated through the prism is so high that the light effect is good to take a dip to a living room of average size in colorful light. The luminosity is also relatively high, so the effect is clearly visible even in daylight. What, however, has surprised me most is that the prism rotates almost silently! Here I expected from experience with various "cheap disco effects" loud creaking. I'm really excited about the product.