Electromagnetic radiation is one of the many ways that energy travels through space. The heat from a burning fire, the light from the sun, the X-rays used by your doctor, as well as the energy used to cook food in a microwave are all forms of electromagnetic radiation. While these forms of energy might seem quite different from one another Photobiomodulation (PBM) is a treatment method based on research findings showing that irradiation with certain wavelengths of red or near-infrared light has been shown to produce a range of physiological effects in cells, tissues, animals and humans. Scientific research into PBM was initially started in the late 1960s by utilizing the newly Some of the possible dangers and side effects of exposure to elevated levels of electromagnetic radiation include: Incomplete or problematic development of the brain. Disruption of a baby’s sleep cycle. Negative impact on the immune system. Negative impact on the reproductive system. These side effects are amplified for babies whose brain and An LED is a directional light source, with the maximum emitted power in the direction perpendicular to the emitting surface. The typical radiation pattern shows that most of the energy is emitted within 20° of the direction of maximum light. Some packages for LEDs include plastic lenses to spread the light for a greater angle of visibility. Dirty Electricity from LEDs People interested high fidelity sound systems or low-EMF environments want to minimize electromagnetic interference (AKA: EMI, High-Voltage Transients, Electrical Noise, and Dirty Electricity) from lighting systems. Compact fluorescent lightbulbs (CFLs) - the curly pig tail variety with some mercury in them - are notoriously "dirty" and create significant EMI Battery connected across the p-n junction makes the diode forward biased, pushing electrons from the n-type to the p-type and pushing holes in the opposite direction. Electrons and holes cross the junction and combine. Photons (particles of light) are given off as the electrons and holes recombine. In fact, even modern high-efficiency light bulbs still tend to produce more IR light than visible light; light sources with efficiency higher than 50% are quite rare. A decent LED light bulb might have an efficiency around 20%, which means that for each watt of light, it emits four watts of heat (either direct IR radiation or cascading through A lamp emits infrared radiation at a much faster rate than the hands will, raising their body temperature. The appearance of a surface will affect the rates at which it will absorb and emit radiation energy. For example, shiny, metallic surfaces will absorb more energy while dark objects will absorb more than a white surface. .

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