Unfortunately LED lamps have not yet the promised life. One of my two lamps used shone after about 500 hours of operation only at half brightness. Conversions also turns out even difficult. The Anbierter not respond to mails. Also a way to keep operating costs low. Sell just announced. In such a product very soon passes the desire to buy. I'll soon he prefers to rely on the more expensive branded products. They are then cheaper.
