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How does a colour changing LED work?
Strictly speaking, an individual LED can’t change color. Instead, a color-changing LED is made up of three separate LEDs in one casing, with a micro-controller operating them. The three LEDs are red, green and blue, so any of these colors can appear at a specific time simply by passing a current through one LED.
What is the function of LED blue light?
LEDs have a longer lifespan, emit less heat, and use less electricity than both incandescent and compact fluorescent light sources. The invention of blue LEDs meant that blue, red, and green could all be combined to produce white LED light, which can function as an alternative energy-saving light source.
What different color LED lights mean?
The lower the color temperature, the warmer the light will appear, or the redder it will appear. The higher the temperature, the cooler the light will appear, or the bluer it will look.
Are blue LED lights bad for eyes?
A 2012 Spanish study found that LED radiation can cause irreversible damage to the retina. A 2019 report from the French Agency for Food, Environmental and Occupational Health and Safety (ANSES) warned of the “phototoxic effects” of blue light exposure, including an increased risk for age-related macular degeneration.
How does a LED light dimmer driver work?
Depending on the type of LED driver you select, their dimming skill can cover the full range. The driver dims the LEDs by either shortening the amount of leading current going through it, or by a method called pulse width modulation (PWM). Most drivers that offer dimming use PWM.
Why do I need a constant current LED driver?
In the beginning, we mentioned using a constant current LED driver because these power modules can vary their output voltages to match the series circuit. As LEDs heat up their forward voltages change, so it’s important to use a driver that can vary its output voltage, but keep the same output current.
What is a LED driver and what does it do?
What is an LED Driver? An LED driver is a device that does exactly what it sounds like — it drives the power to one or more LEDs. As we mentioned previously, a good thing about LEDs is that they are energy efficient — they do not require a large amount of power to get them going.
What happens to the forward voltage of a led?
Forward Voltage is the amount of volts the light emitting diode requires to conduct electricity and light up. As temperature increases, the forward voltage of the LED decreases, causing the LED to draw more current. The LED will continue to get hotter and draw more current until the LED burns itself out, this is also known as Thermal Runaway.