Twin Tube is a fluorescent lighting fixture that consists of two parallel tubes, as opposed to the single tube found in traditional fluorescent lamps.

ELV Dimming (Electronic Low Voltage Dimming) is a dimming technology utilized in the lighting industry for light fixtures that employ electronic transformers.

ETL (Electrical Testing Laboratory) is a division of Intertek, a renowned company that provides assurance, testing, inspection, and certification services across various industries.

The luminance ratio is the ratio of average luminance to window luminance. It serves as an indicator of the brightness contrast between a daylight source and the entire visual field.

Cool white is a term used in lighting to describe a specific color temperature of white light. It typically falls within the range of 5000-6500K on the Kelvin scale.

A light transformer is an electrical device specifically designed to step down the voltage of an electrical power supply to a lower voltage suitable for use with lighting fixtures.

Lumen maintenance is the measurement of how well a lighting product retains its initial lumen output over time. It is a factor in evaluating the performance and longevity of light sources and luminaires.

Economic life in the context of lighting means the duration or lifespan of a lighting system or product in relation to its economic viability and profitability.

Illumination refers to the amount of light that falls on a surface per unit area. It is a measure of the brightness or intensity of the light that illuminates a given space.

In the context of the lighting, frosted lens refers to a specialized type of lens that is designed to conceal LED diodes while still allowing for effective light transmission.