Disassembled 7-watt LED light bulb (470lm) manufactured by V-TAC (Sofia, Bulgaria). Enough quality product for 9€. There were found out next properties during examination: *Advantages: ** cosφ=1 ** very bright SMD5630 LEDs ** power supply is equipped by filter ** serious protection against overvoltage ** simple construction of power supply - it is easy to repair it ** very big and heavy heat sink *Disadvantages: ** intermediate level of flickering ** PVC-wires between power supply and LED matrix are lined inside heat sink, which may bring to short circuit on continious operation