Only in a UK domestic application
In the UK, domestic lighting circuits are normally 6 Amps, with no ring. Therefore connecting '13 Amp' sockets could easily overload such a circuit.
However in an industrial environment, the lights often require more than 6 Amps at 240 volts, therefore the light switch and circuit would either be heavier duty or be connected to the lights by a much higher rated relay and circuit, which could also be used for mains outlets.
Other countries are different, the US has been mentioned, but there are so many examples. E.g. German domestic wiring is all 16 Amps, but most German houses are supplied with 3 phase, so high current devices like cookers are often 3 phase and there are no separate lighting circuits (mains sockets are often placed under light switches!). There are no ring mains in Germany, so all circuit breakers are 16 Amps and no fuses are required in mains plugs.
On the subject of UK mains circuits... UK ring mains circuits are a dangerous anachronistic oddity which should be outlawed! Devised at a time when copper was in short supply, to reduce the amount of copper required to wire a house. Just consider what can happen to the 16A rated wire in a broken ring with a few electric fires connected on one side of the break!!! The 13A (or lower) fuses in UK mains plugs are only there because of the crazy domestic ring mains wiring, which could allow 32 Amps to flow through a faulty appliance.
Biting the hand that feeds IT
