DIY

Capacity is decided by the track conductors and the feed connector, not by how many heads physically clip into the channel along its length.

Some fixtures are marked requiring conductors rated above the common baseline, which older homes may not have in the ceiling box waiting for them.

The thin high-temperature conductors inside a luminaire are built for a specific confined job and are not a substitute for branch circuit cable anywhere else.

Dropping a modern module into an existing housing does not change the insulation-contact rating, the wattage limit or the wet-location listing printed inside it.

A fixture that lights normally then goes dark after twenty minutes and returns later is reporting a heat problem through a protective device working exactly as designed.

The designation describes whether thermal insulation may touch the housing, which is a construction question rather than anything to do with lamp wattage.

Being listed for fan support is not a blank permission; the marking states a maximum weight, and heavier fans need a brace or a structural attachment.

A motor is an inductive load that draws current out of phase with voltage, which is why a control designed for lamps overheats and makes the fan hum.

The brief surge when an electronic driver energizes can be many times the running current, which is why a lightly loaded control still welds its contacts shut.

A photocell responds to the light reaching its window, which is why nearby fixtures, shade and dirt matter far more than the time of year.