MESTAR uses SMD LED (surface mount diode), high-power LEDs and Chip-on-Board LED (COB) that provides an advantage to the end user by obtaining the highest lumen output & most suitable light engine for the application.
Using the highest quality of LEDs in the development of new luminaires applied with highest efficiency lens and optics system, MESTAR can provide most kind of industry distribution
LEDs in MESTAR’s luminaires provide in the following options:
SMD LED: Warm color: 2700K; Warm color: 3000K; Warm white: 3500K; Natural white: 4000K; White 5000K; White: 5700K; Cool Day Light: 6500K
High-power LED: Warm color: 2700K; Warm color: 3000K; Warm white: 3500K; Natural white: 4000K; Natural White 4500K; White 5000K; White: 5700K
COB LED: Warm color: 2700K; Warm color: 3000K; Warm white: 3500K; Natural white: 4000K; White 5000K; White: 5700K; Cool Day Light: 6500K
LED Color rendering
The color rendering index (CRI or Ra) is a measure of how well a light source reproduces the color of an object compared to a standard source. The index value is computed from how well the light source under test reproduces the color of the number of standard color swatches. Generally, color rendering index between 80 and 90 is good and value between 90 and 100 considered as very good.
MESTAR provides CRI value >80 for general indoor and outdoor as standard, however CRI >90 is optional upon the request, for general and public area lightings such as flood lights, road lights the CRI >70.
LED Color deviation
MESTAR uses high-power LEDs and Chip-on-Board LED (COB) with 3 SDCM (3-Step MacAdam ellipse) as the highest standard which currently available in the market. The color deviation between LEDs rarely found by human eye perception.
The SDCM (Standard Deviation of Color Matching) value defined from visual color matching experiments its shows the standard deviation of the color 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 maximum color deviation of light sources referred to as MacAdam ellipse of a certain step size SDCM.
LED Lumen maintenance
MESTAR 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 MESTAR LEDs is less than 10% after 50,000 hours. MESTAR 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 is the latest method adopted by the Illuminating Engineering Society for quantifying color rendering properties of light sources, these results distinguish both color fidelity and color 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 MESTAR now provides TM-30-15 as well as CIE Ra and CIE R9 reports.