LED Technology

LED Technology


LIGMAN uses high-power LEDs and Chip-on-Board LED (COB).  This provides an advantage to the end user by obtaining the highest lumen output & most suitable light engine for the application.

The high quality of LEDs supplied with Ligman luminaires in conjunction with the highest efficiency lens & optical systems will provide the greatest distribution variety in the industry.

The highest quality of LEDs in the development of new luminaires applied with highest efficiency lens and optics system. LIGMAN provide most kind of industry distribution.

i.e. VN: very narrow, N: narrow beam, M: medium beam, W: wide beam, VW: very wide beam: E: elliptical beam, Type II, III and IV classification from IESNA for roadway and area lighting applications.


LED Spectrum

LEDs in LIGMAN luminaires provide optional:
neutral white (nw: W40, 4000K)  warm white (ww: W30, 3000K) warm (w: W27, 2700K).

All LEDs do not generate UV or IR radiation and have very low colour fading rate than conventional lamp.


LED Colour rendering

The colour rendering index (CRI or Ra) is a measure of how well a light source reproduces the colour of an object compared to a standard source. The index value is computed from how well the light source under test reproduces the colour of a number of standard colour swatches. Generally, colour rendering index between 80 and 90

is good and value between 90 and 100 considered as very good.

LIGMAN provide CRI value >80 for general outdoor as standard, however CRI >90 is optional upon the request.


LED Colour deviation

LIGMAN uses high-power LEDs and Chip-on-Board LED (COB) with 3 SDCM (3-Step MacAdam ellipes) as the highest standard which currently available in the market. The colour deviation between LEDs rarely found by human eye perception.

The SDCM (Standard Deviation of Colour Matching) value defined from

visual colour matching experiments its shows the standard deviation of the colour discrimination variations from a specific center on the xy chromaticity diagram based on ANSI engineer Davis Lewis MacAdam described. Increasing size of ellipse can classify the maximun colour deviation of light sources referred to as MacAdam ellips of a certain
step size SDCM.


LED Lumen maintenance

LIGMAN we designed our own LED light engine to maintain the thermal  below the critical temperature range and we properly input the optimum driving current when properly operated to ensure maximum luminous flux output together with serving a long life of LEDs.

The failure rate of LIGMAN LEDs is less than 10% after 50,000 hours. LIGMAN uses LEDs with the specification of L80/B10 at 50,000h, this means that after 50,000 hours, at least 90% of the LED still achieve 80% of their original luminous flux.


TM-30-15 (LATEST)

TM-30-15 is the latest method adopted by the Illuminating Engineering Society for quantifying colour rendering properties of light sources,  these results distinguish both colour fidelity and colour gamut and provides a framework for interpreting chroma and hue shift associated with light sources.

In keeping with the new measurement standards and meeting market requirements Ligman Lighting now provides TM-30-15 as well as CIE Ra and CIE R9 reports.



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