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LED measurement in Beauty Industry
Nguyễn Khánh Linh - 09/05/2023
Brightness measurement is the process of quantifying the amount of light reflected or emitted by a surface, and is typically used to evaluate the visual perception of a surface's whiteness or color. Brightness can be measured using a variety of methods, including photometric or spectrophotometric techniques.
- Photometric techniques measure the amount of light reflected by a surface using a luminance meter or similar device. The brightness value obtained through photometric measurement is typically expressed in units of luminance, such as candela per square meter (cd/m²).
- Spectrophotometric techniques measure the reflectance or transmittance of light across a range of wavelengths, and can provide a more detailed characterization of a surface's spectral response. The resulting spectral data can be used to calculate various brightness indices, such as whiteness or yellowness indexes.
In this article, we will discuss the application of spectrophometric technique by using spectrometers of Ocean Optics ( Ocean Insight)
Applications:
Brightness measurement is an important tool for monitoring the performance of LEDs (Light Emitting Diodes). LEDs are widely used in various applications such as displays, lighting, and automotive applications, and it is critical to maintain their brightness and color consistency over time.
Brightness measurement can be used to assess the luminous flux or radiant flux output of LEDs, as well as their color temperature and color rendering index (CRI). These parameters are important for ensuring that the LED light output meets the desired specifications for a particular application. Morover, the brightness measurement can also be used to assess the uniformity of light output across an array of LEDs. This can be important in applications such as display backlights or automotive lighting, where consistent brightness and color are critical for optimal performance.
In beauty industries, LED mask is more and more popular when this machine can help beauty lovers can treat their skins with sepearated functions by different wavelengths of LED.
| Color | Wavelength Interval In nanometers | Treats Skin Conditions |
| Infrared light (invisible to the eye) | ~ 700 – 1,000 nm | Penetrate deeper into the skin for amplified results |
| Deep Red with Infrared light | ~ 650 – 1,000 nm | Wrinkles, volume loss, wounds, cystic acne |
| Red | ~ 700 – 635 nm | Skin repair, hydration, sunken skin, Sun damage, Rosacea |
| Orange | ~ 635 – 590 nm | Rosacea and skin redness |
| Yellow | ~ 590 – 560 nm | Redness, inflammation, sun daamage, visible veins, scaring |
| Green | ~ 560 – 520 nm | Uneven skin tone, brown spots, freckles |
| Cyan | ~ 520 – 490 nm | Swollen capillaries |
| Blue | ~ 490 – 450 nm | Acne, eczema, psoriasis |
| Violet | ~ 450 – 400 nm | Increase cell regenerati |
One of the potential options using to test the performance of LED by Ocean Insight spectrometer is Ocean-FX-VIS-NIR spectrometer (350-1000 nm), a FOIS-1 integrating sphere, Custom optical fiber with the HL-3P-INT-CAL radiometrically calibrated light source as the reference. Using the processed mode in OceanView, we corrected the spectral data for the instrument response function of the Ocean FX spectrometer, with intensity reported as power in microwatts per nanometer (uW/nm). By using this spectrometer, it is easier and more time-saving when they can choose the suitable wavelength for the specific purpose.
