It depends on the size of the restaurant. If it is about 10 square meter, then 3W is enough (LED lights are standard). If 20 square meters suggest 8W, generally 4-6 is good, and finally the conversion between LED and ordinary light bulb:

Comparison of brightness and energy saving between LED lamps and traditional lamps;

1, 1W LED= 15W incandescent lamp =3W CFL (energy saving lamp).

2.3W LED=8W CFL (energy saving lamp) =25W incandescent lamp.

3.4W LED= 1 1W CFL (energy-saving lamp) =40W incandescent lamp.

4.8W LED= 15W CFL (energy saving lamp) =75W incandescent lamp.

5. 12W LED=20W CFL (energy saving lamp) = 100W incandescent lamp.