Citizen COB LED Guide

Citizen Electronics is a major chip-on-board (COB) LED maker, popular for spotlights, downlights, and track fixtures that need a compact, focusable source.

Property Detail
Package Chip-on-board (COB) arrays
Main series CLU and CITILED families
High-CRI line Vivid, for color-critical work
Color temperature 2700 K to 6500 K
Common use Spots, downlights, track

Why Citizen COB

Citizen COBs offer a wide range of sizes and flux levels with consistent color, making them a flexible base for directional fixtures. The Vivid line targets retail and gallery work where color rendering matters.

As with any COB, a matched holder and solid heat sinking are essential to reach the rated output and life.

Match holder and optic. COB arrays rely on a precise holder to align the optic and dissipate heat. Pair the Citizen array with its specified holder and reflector or TIR lens.

See the Bridgelux Vero Series and the Lens Material Properties.

Working with COB LEDs

Citizen Electronics is a major maker of chip-on-board (COB) LEDs — arrays of many small chips packaged together on one module to act as a single bright, compact source. COB modules suit spotlights, downlights, and track fixtures because their concentrated emitting area pairs well with reflectors and lenses for tight, controllable beams. When choosing a COB, the key specs are consistent across brands: luminous flux (lumens), efficacy (lm/W), CRI for color accuracy, color temperature, and the light-emitting surface (LES) diameter, which determines which optics fit. Higher-CRI options suit retail and display lighting where color rendering matters most.

Scroll to Top

The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.