The JDD light bulb is kind of tubular shape light bulb, comes in incandescent and halogen. It common used in residential and commercial applications, such as studio light. The most popular fitting is E27. Can be selected in clear and pearl finish.
The JD type halogen lamps are tubular shaped and run on line voltage. They are used in display cases, retail stores and restaurant. The most popular fittings are BA15d, E11, E14.