Which safety measure should be followed when replacing a CFL or LED lamp connected to a DC power supply?
Turn off the power supply before handling the lamp
Any lamp connected to a DC supply keeps its holder, base and contacts live as long as the supply is on.
The guiding safety principle is to remove the hazard at its source before touching electrical equipment.
For a lamp change that means turning off the power supply first, so no voltage remains at the fitting.
With the supply isolated, the contacts are dead and the risk of electric shock while gripping or twisting the lamp is eliminated.
Wearing gloves only adds a layer of personal protection but leaves the circuit live, so a single fault could still cause a shock.
Working quickly does not de-energise anything, and using a wet cloth is actively dangerous because moisture conducts electricity and increases the shock hazard.
Hence, the answer is Turn off the power supply before handling the lamp.
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