I ordered this Scharzlichtlampe for a child's birthday. The light is enough good for a 15 square meter room. I would not buy the lamp again, since it is also a "black light energy saving bulb 25 W / E-27" is on Amazon for the same price. This lamp I have to compare ordered and found that both lamps by the manufacturer "Omnilux". Those who want to raise more Scharzlicht W at the same price 5, the "black light energy saving bulb 25 W / E-27" by Steinigke Showtechnic should order. Nevertheless I forgive 5 stars because I this review only the product, not the price.