What about the Yin Yan Flash?

Yin Yan has been closed for many years since the contract expired. Yin Yan Company also changed its name.

There are many kinds of Yin Yan brands in the market: Changzhou Yin Yan; The former Beijing-Yin Yan employees set up their own companies; Fake. . . .

The original Yin Yan is still good in China. The main components have been tested, but the main capacitor is not as good as that imported. It needs to be recharged for a period of time (3 months). Some front lenses are not plexiglass, but transparent polystyrene, which has poor wear resistance and light transmittance. Because of the refractive index, the middle is brighter than the four sides (not very uniform).

for reference only