Dimming problems begin before the first switch.

“Dimmable” is not a complete specification.

The word does not identify the control interface. Phase-cut, DALI, analogue and PWM arrangements operate differently. List the intended control system, driver model and LED load together. Ask for confirmation of the exact combination, including any limits that appear only at low output.

Match the driver to the load.

Constant-voltage tape and constant-current luminaires require the correct output type. Matching watts alone is not enough. Check the rated output voltage or current, usable load range, thermal conditions and control wiring. Review the manufacturer’s instructions rather than substituting a generic loading rule.

Test the behaviour people will notice.

A practical sample test should include switch-on from minimum output, dimming down, return after a power interruption and interaction with the intended wall control. Observe the result at the actual viewing conditions. Record flicker, stepping or noise rather than describing the result only as “working”.

• Name the exact driver, controller and light source.
• Agree the minimum usable output for the room.
• Check behaviour after loss and restoration of power.
• Retain the approved settings and wiring information.

Keep maintenance in the design.

A concealed driver still needs accessible servicing and an appropriate thermal environment. Include its location on the drawing and allow a practical replacement path. Confirm installation with the appropriately qualified electrical contractor before the enclosure or joinery is closed.

Common questions