LED Chip


Seoul Semiconductor

Verify ID:


Expiration date:

November 03, 2023 - November 02, 2024

Verification Mark

Applicable To:

STWSC12S-EX, STWSC2PB-EX (4000K~6500K), SAWS0661A (4000K~6500K), STW9C2SB-S

Marketing Claim Verified by UL Solutions

LED Chip Color Rendition Rating DIAMOND based on IES TM-30-20 Stable Fidelity Intent

Verification Method

The product is measured with an integrating sphere according to ANSI/IES LM-85, Approved Method: Optical and Electrical Measurements of LED Packages and Arrays and the color rendition calculation is based on ANSI/IES TM-30-20, IES Method for Evaluating Light Source Color Rendition. The following criteria are used to rate the performance of the Stable Fidelity Intent under a ‘matrix of tests’ with varying five input currents and three ambient temperature conditions: The fidelity design intent of TM-30-20 is graded as follows: Diamond: Rf ≥ 95 Platinum: Rf ≥ 90, Rf,h1 ≥ 90 Gold: Rf ≥ 85, Rf,h1 ≥ 85 The radiance ratio of light in the range 415 nm-455 nm versus a total range of 400 nm-500 nm is graded as follows: Diamond: ≤ 48% Platinum: ≤ 50% Gold: ≤ 52% Spectral Difference (SD) refers to the difference in radiometric power between the artificial light source and its reference for visual light from 400 nm to 699 nm. Performance is graded as follows: Diamond: 425~474 nm: ≤ 25%, 630~699 nm: ≤ 35% Platinum: 425~474 nm: ≤ 40%, 630~699 nm: ≤ 50% Gold: Not required

About the Company

Seoul Semiconductor is the world’s second-largest global LED manufacturer, a ranking excluding the captive market, and has more than 14,000 patents. Based on a differentiated product portfolio, Seoul offers a wide range of technologies, and mass produces innovative LED products for indoor and outdoor lighting, automotive, IT products, such as mobile phone, computer displays, and other applications, as well as the UV area. The company’s world’s first development and mass production products are becoming the LED industry standard and leading the global market with a package-free LED, WICOP; a high-voltage AC-driven LED, Acrich; an LED with 10X the output of a conventional LED, nPola; a cutting edge ultraviolet clean technology LED, Violeds; an all direction light emitting technology, filament LED; a natural sun spectrum LED, SunLike; and more. For more information, please visit www.seoulsemicon.com/en.

What is UL Verification?

UL Verification is an objective, science-based assessment that confirms the accuracy of marketing claims. Our independent assessment process scrutinizes the validity of specific advertising or promotional statements, giving you a way to separate verified fact from fiction.