Recessed housing with an integral transformer.

Track powered at low voltage by a step-down transformer (generally remote).

Unit of light output.

Light output per unit of energy consumption.

The metric unit of illuminance, equal to one lumen per square meter.

Shaped by mechanically forcing air into molten glass so that it takes the shape of the mold. Incandescent lamps are machine blown.

Uses a magnetic (iron) core and copper windings to regulate the current that drives a lamp. Magnetic ballasts produce audible hi, and flicker. They are heavier and less efficient than electronic ballasts, but they cost less. They are no longer used in better quality fixtures.

Uses magnetic (iron) core and copper windings to reduce line voltage (120 volts) to low voltage. Magnetic transformers produce audible hum. They are heavier and bulkier than electronic transformers but simpler and less costly to dim. Remote transformers over 300 watts are generally magnetic.

In dimming, the primary control location where you can set the scenes, fade rate, and other variables.

Matte finished surface produce a predominantly diffuse reflection, lightly textured, dull, not shiny.