Start the Powercalc config flow, choose Virtual power (library), and pick 3A Smart Home → LXN56-DC27LX1.3.
Add this to your configuration.yaml, replacing light.my_light with your own entity.
powercalc:
sensors:
- entity_id: light.my_light
manufacturer: 3a smarthome
model: LXN56-DC27LX1.3