BRIGHTNESS & EFFICACY

Introduce high efficacy LED solution

High Efficiency or high CRI? There will be no tangle any more.

Most of photography application wants lighting with high CRI & luminous efficacy(lm/W), but these two cannot be achieved altogether. In fact, it can be easily found from the LED market that they announce their LED has 140 lm/W or even 160 lm/W with CRI 70 or 80,but there can be rarely found LED has 140/W with CRI 95. Yuji now launches BC-2835DL with 140lm/W & CRI 97, 40% efficacy increased.

The lighting of filming site is sometimes limited by rated power of the power supply. If the power of the power supply is not enough to reach sufficient illuminance, the only way is to pull the light source closer to obtain sufficient illuminance. The shortening of the distance between the light source and the shooting object will lead to the failure to achieve the desired result in some filming scenes.

Features

• High luminous efficacy LED means more lumen output at the same electrical power.
This makes the portable batteries in lighting kit last much longer.
• High luminous efficacy LED means higher light conversion and less heat conversion.
Less heat leads to increasing stability of light emitting and color coordinates shift.
• High luminous efficacy LED means higher ratio of lumen per dollar.
• High efficient LED may more expensive than normal LED, but improvement on
optical performance, heat dissipation performance and PCB substrate saving will
save more in further steps.

Yuji SMD Products Comparison

PHOTOBIOLOGY SAFETY

IEC/EN 62471 Certificate

Illumination Standards for Eye and Skin Safety.

Valid for:

The classification - Exempt Group (RG 0) is complied for all Yuji SMD LED.

Click here to acquire Yuji LED - IEC 62471 certificate

IEC/EN 62471 gives guidance for evaluating the photobiological safety of lamps and lamp systems including luminaries. Specifically it defines exposure limits, references measurement techniques and the classification scheme for the evaluation and control of photobiological hazards from all electrically powered incoherent broadband sources of optical radiation, including LEDs (but excluding lasers), in the wavelength range from 200 nm through 3000 nm.

Classification

According to EN 62471:2008 sources of optical radiation are classified into risk groups subject to their potential photobiological hazard.

Blue light hazard (photoretinitis)

The photochemical retinal hazard involves a photochemical process in which highly energetic short-wave radiation causes damage, in some cases irreversible, to the retina.

The main area of concerns lies between 400 nm and 500 nm (= blue light). The critical aspect in terms of the harm potential however is not the blue component itself, but rather the energy content in this range of the spectrum, which depends essentially on the luminance (effective blue light radiance).

Gazing up at a blue sky (very high proportion of blue light, but scattered, so luminance low), for example, is completely harmless, but even very brief exposure to direct sunlight, which has a very high radiance, can lead to damage.

The radiation absorbed — which depends on the intensity of the incident light and the length of exposure — causes photochemical decomposition of the pigments present in the photoreceptor cells. The photopigment fragments thus created act as free radicals, leading to the death of the photoreceptor cells.

RELIABILITY

How to judge LED lifespan

A widespread rumor is that LED has more than 100,000 hours lifespan, which is simply not true. Unlike other lighting sources, LED rarely fails abruptly. Instead, the intensity of LED emission degrades gently. After 100,000 hours, LED may still work, however, it probably cannot provide usable light any more.

An approach to estimate LED lifespan is to measure the luminous flux remaining after a certain period, which is called lumen maintenance. The corresponding approaches are specified in the standard LM-80-08 and TM-21-11 authored by IESNA. LM-80 defines test methods to collect data of LED output performance at selected elapsed time at 3 different operation temperatures. While TM-21 details how to extrapolate the future performance from LM-80 data tested in a relatively short term.

The reliability of YujiCapture

All products in YujiCapture series took the tests of LM-80 for 9,000 hours, 1.5 times longer than the minimum requirement, after which, they still illuminate more than 95% of the original lumen. Satisfying with the prediction method 6X specified in TM-21, L70 (time elapsed to 70% lumen maintenance) is larger than 54,000 hours. Thus, benefits from Yuji’s unique phosphor technology and advanced thermal dissipation design, the long life time not only reduces your maintenance cost, but also makes your equipment more reliable, with which you could focus on your creation instead of the trivia about the tools.

ECO-FRIENDLY & ELECTRICAL SAFETY

RoHS Compliance of Yuji LED Products

All YUJILED SMD products on the website and in our LED catalogs comply with the Restriction of the Use of Certain Hazardous Substances (RoHS) in Electrical and Electronic Equipment.

The LED chipsets used in the luminaires are Pb-free soldering compatible (Max Soldering Temp. 260℃) so that these LEDs can be used as environmentally safe products.

Click here to acquire Yuji LED - RoHS compliance

Here is the RoHS website for more info.

CE CERTIFICATE of Yuji LED Luminaires

The CE mark is mandated for certain products sold within the European Economic Area, enabling freedom of movement in the European market.

This marking means that the manufactured product meets EU safety, health and environmental standards that have been stipulated by legislation. Products demarcated with CE are not necessarily produced in Europe, but the marking means they can legally be sold there.

Click here to acquire Yuji LED - RoHS compliance

Here is the CE mark website for more info.

If you have any questions or concerns regarding the certificate or compliance of our LED products, please contact our support team and they will be happy to address your concerns in a timely manner:

info@yujigroup.com

https://www.yujiintl.com/contact.html

STANDARDIZATION

Standardized testing approaches fulfill LM-79

To provide reliable and reproducible accurate measurements of photometric, colorimetric and electrical parameters of LEDs, YujiCapture applies standardized instruments, the Everfine test system, including the world-leading high-speed spectroradiometer HAAS-2000 and integrating sphere with advanced coating for perfect diffuse performance, under strict conditions, such as constant 25℃ ambient temperature, which fully meet the procedures and precautions described in IESNA LM-79. Besides, the instrument error and calibration cycles are handled cautiously by our expertise engineers to ensure the accuracy of the results.

Therefore, from YujiCapture, you will not only get professional detailed specifications, including luminous/radiant flux, electrical power, luminous efficacy, spectrum power distribution, chromaticity coordinates and etc., but also could trust them. These will surely promote your original design of any photographical or cinematographic lighting systems.