The LED electric rotary lamp (National patent number ZL03 2
21186.4) of our institute is not same to traditional rotary lamp.
It has no rotary glisten bowl, no electric motor, no filament bulb,
and no transformer. It makes error rate of a big drop. It has a
very long useful time. Its normal useful time can reach 20,000
hours. So it can be called half-permanent product. And it also
saves electricity very much. In a state of AC, the power is only
2W. In the other hand, it has not noisy at all without machinery. AC, DC voltage rank, flicker frequency, color of flicker and form
of lamp cap (screw sheel or bayonet sheel) all can be chosen by
customers.