Measure used to evaluate the efficiency of an investment, calculated as (gain from investment - cost of investment) / cost of investment.

Property used for business purposes, including office buildings, retail spaces, and industrial properties.

Legal document transferring ownership of real property from one party to another.

Periodic fluctuations in the real estate market, typically moving through phases of expansion, peak, contraction, and recovery.

Dual In-Line Package (DIP) chips were used in some of the first general illumination LEDs. The chip is encased in hard plastic with 2 straight parallel connecting pins. The epoxy covering focuses the light produced to a beam angle of approximately 60˚ or 45˚. Although DIP chips are still used today, they have a much lower efficiency than the newer LED chips. Delivering approximately 4 lumens per LED, they individually pull between 0.05 and 0.08 watts to generate between 35 and 80 lumens per watt. DIP have suffered from inherent heat management problems

Instrument furnishing artificial light.

Element that provides power to lights.

Mechanism controlling the power to a system of lights.