The HSN (Harmonised System of Nomenclature) code for table lamps falls under the heading 9405, which includes lamps and lighting fittings.
Here is a description:
94: Furniture; beds, mattresses, mattress supports, cushions and similar stuffed goods; lamps and lighting fittings, not elsewhere specified or included; illuminated signs, illuminated name-plates and other similar things; prefabricated buildings
05: Lamps and lighting fittings including searchlights and spotlights and their parts, not elsewhere specified or included; illuminated signs, illuminated name-plates and other similar things, having a permanently fixed light source and their parts not elsewhere specified or included
Specifically, table lamps can be classified under:
9405.20: Electric table, desk, bedside or floor-standing lamps
For GST purposes in India, the GST rate for goods classified under HSN code 9405.20 is generally 18%.