Red light sources: What are the differences between VCSEL, EEL, and LED?

Red light hair growth devices (such as hair growth caps, helmets, and hair growth combs) utilize low-intensity laser therapy (LLLT) to stimulate hair follicles with 650-670nm red light, promoting hair growth and becoming an innovative solution for hair loss treatment. The choice of light source directly determines the device's efficacy, cost, market positioning, and user experience, making it a core consideration for manufacturers when designing hair growth products. Current mainstream light sources include vertical-cavity surface-emitting lasers ( VCSELs ), edge-emitting lasers (EELs), and light-emitting diodes (LEDs), which differ significantly in beam characteristics, wavelength accuracy, efficiency, lifespan, and applicable scenarios.

1. VCSEL (Vertical Cavity Surface Emitting Laser)

· Features : circular beam, small divergence angle (10-20°), wavelength 650-670nm, efficiency 30%-40%, life span 20,000-50,000 hours, power 5-10mW, easy to integrate;

2. EEL ( Edge-Emitting Laser )

· Features : elliptical beam, large divergence angle (10-50°), wavelength 630-670nm, efficiency 20%-30%, life span 10,000-20,000 hours, power 5-10mW, large size.

3. LED (Light Emitting Diode)

· Features : Incoherent light, large divergence angle (120°), wavelength 620-700nm, efficiency 10%-20%, lifespan over 50,000 hours, power 10-20mW, easy integration.

Yuanjing Optoelectronic Technology's Red Light VCSEL Solution

Yuanjing Optoelectronic Technology specializes in the research and development of red light sources for hair growth, offering VCSEL light sources in 2835, 3030, 5050, and 5730 packages, specifically designed for hair growth devices. These light sources feature a wavelength of 650-670nm, power of 5-10mW, efficiency of 30%-40%, and a lifespan of 20,000-50,000 hours. They utilize high-quality chips, provide a uniform beam, and minimize heat generation, complying with RoHS and EN62471 certifications.

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