Physically, power is the amount of electrical energy transferred or converted per unit time. Its unit is Watt (W), equal to one joule per second ((J/s). Most of light-emitting diodes (LEDs) light therapy panels use 3W high-power LEDs, some use 5W LEDs. When turn on the panels, the electricity in an LED is converted to heat rather than light (radiant energy), about 70% heat and 30% light. If the heat is not adequately removed, then the light irradiance, wavelength, and chip lifetime will be considerably affected, and the quality of the LEDs will be less reliable.
Thus LEDs need thermal management to reduce the overheating possibility which has been done by the relevant suppliers, including LED package, IC carrier (PCB), and more. It is also critical that when suppliers of red light therapy devices assemble the LEDs in the unit, they have to nicely control the heat dissipation system to keep the LEDs working at the appropriate temperature and environment.
Up to the present day, we have observed a large number of red light therapy panels on the global market and found that the majority of them use cooling fans to achieve heat dissipation. The detailed ways of heat dissipation are different, and we summarize and classify them into three types.
Firstly, numerous fans + side air outlets.
They designed numerous fans on the back of the light panels. During operation, these fans blow air into the interior of the lamp housing and exhaust thermal energy through side holes. In the manner of thermal management, the housing material is commonly iron.
Advantages: Lower cost.
Disadvantages: 1) The overall appearance looks not excellent and lacks integrality. Due to the large area of holes lining the sides of the LED light therapy lamp; 2). Numerous fans make a bit more noise; 3) Unperfect heat dissipation effect. Flowing air from the fans cannot reach each of the LEDs, especially at the corners or edges, and then some of them will be working at higher temperatures than others, leading to a shortening of their lifetimes with long-term overheating. In particular, for those light panels in commercial use, or when an entire household or multiple body parts require frequent therapy. This shortcoming will manifest itself over time.
Secondly, numerous fans + side air outlets + heat sinks.
This was a simple upgrade from the first type, and a small number of lamps with the same iron frames used this design.
Advantages: Good heat dissipation results.
Disadvantages: 1). The large area of side holes makes the appearance look imperfect; 2). Noise from numerous fans is a little bigger.
Thirdly, fewer fans + rear air outlets + aluminum heat sinks.
This design was applied by a small number of vendors. Infrared Red Light combined it with an aluminum alloy housing, and Joovv combined it with an exquisite plastic body.
Advantages: 1). Excellent heat dissipation ability. As it is known that aluminum alloys have remarkable heat accumulation and conduction properties, adding discharging heat air flow in a directional manner, Infrared Red Light adopts aluminum heat sinks and housing, along with our own patented cooling system, to keep each LED at a low temperature; 2). Clean lines and handsome appearance. There are no side apertures, and an entire frame protects the unit; 3). Lower noise. Fewer fans are needed.
Disadvantages: Higher cost. More effort has been put into the design, from the appearance to the thoroughness and effectiveness of the thermal emission, to enhance the reliability and lifetime of the device and to ensure a satisfactory customer experience in every aspect.