1: Packaging of LED light bulb is rough, imprinting is not clear, no industry name, no address, no telephone and no standards of implementation
2: Appearance of the LED light bulb is dirty, black filament and twisted, the holder of the lamp is rust and dull, clear tilt head, crooked shoulders and crooked pin, lamp holder without typing or only with specifications but no grades number.
3: Low mechanical strength, blister thin, fragile, head thin, feet and skin of the LED light bulb are sinking pressed by nail.
4: Most of optical parameters are unqualif