3818001100 Monocrystalline silicon wafer 7.5 cm≤diameter≤15.24 cm (doped for electronics industry)
3818001900 Monocrystalline silicon wafer 15.24 cm diameter (doped for electronics industry))
3818009000 Other doped crystal wafers for industrial use (including doped chemical elements and compounds for the electronics industry)
So: specifications 125* 125 are available 3818001100
156*156 specification is available 3818009000
HS encoding is not something people need to add, reduce or change. To complete these actions, it may take a year or several years. If you can't find the code you think is suitable, you can check the latest customs code books and choose the most reasonable or similar one. You can also check the Chinese customs website or call your local customs department responsible for classification of products.
Customs HS code of solar panels: 8541402000, tax discount rate 17%, no product inspection required
HS code of lamp head: 8536610000, discount rate of tax 17%, product inspection required
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PS: Because I don't know the material of your socket, so I can't give a more accurate HS code. The current tax code for lamp sockets refers to sockets with a voltage ≤ 1000 volts. . After all, tax refund rates may be different depending on the HS code.