Light is everywhere in our world. Light gives rise to moods and emotions and affects our biological rhythms. We need it to see: it carries information from the world to our eyes and brains. Seeing colors and shapes is second nature to us. yet light is a perplexing phenomenon when we study it more closely. To understand these effects we need to know something of the physics, physiology, neurology and psychology of light.
The presence or absence of visible light affects the mood through Neurophysiology based on our cognitive as well as our unconscious perceptions. This part of the nervous system is primarily connected with neurobiology, psychology, neurology, clinical neurophysiology, electrophysiology, biophysical neurophysiology, ethology, neuroanatomy, cognitive science and other brain sciences.
Fatigue and headaches are incidentally caused by poor lighting or by light flickers. In workplaces, bright light has been recognized to increase and stimulate alertness and improve cognitive function. Low levels of illumination calms the sense. Depression and poor immune system are often triggered by the absence of daylight. While emotional stress and other physical ailments can also be linked to insufficient lighting. While uncovered lamp bulbs may cause irritation as light produces UV and radiation.
The difficulty in seeing caused by direct or reflected light is known as glare and can be classified according to its effect on a person. A blinding glare is when one stares into the sun that could totally blind and leave temporary or permanent visual deficiency. Disability glare is the blindness caused by oncoming car lights or scattering light in fog or in the eye. While discomfort glare, although not dangerous as the two previous types of glare could cause annoyance or irritation.
Seeing Color: Color is more than decoration, and perceiving color is tricky.Human being’s visual system only responds to the very small part of the electromagnetic spectrum lies between 380 and 760 nanometers. However, it does not respond uniformly.
Color Rendering:Did you ever wonder why you see the colors you do or if other animals see the same colors that you see? We see light that bounces off of things around us. When the light enters our eyes, special cells tell our brains about the light. These cells are called photoreceptors. Light is made of little bits called photons.
- As globalization continues and the earth's natural processes transform local problems into international issues, few societies are being left untouched by major environmental problems.Some of the largest problems now affecting the world are Global Warming, Energy Crisis, Air Pollution, ,Waste, Ozone Depletion, Water Pollution, and Rain Forest Destruction.etc.
- CFLs(Compact Fluoresent Lamps), like all fluorescent lamps, contain small amounts of mercury as vapor inside the glass tubing, averaging 4.0 mg per bulb. A broken compact fluorescent lamp will release about 4% of its mercury content. When considering the mercury content in emissions from coal-fired power plants, fluorescent bulb use results in about 70% less mercury put into the atmosphere than incandescent bulb use. However, a concern is that broken bulbs will introduce the mercury directly into a populated indoor area.
- For example: If all 4 billion incandescent sockets were filled with CFLs Americans'd have nearly 50,000 pounds of mercury spread around every single US household.
- By switching to LED lighting we can also help address concerns of high electrical cost as well as energy conservation, while helping cooling down the warmer earth.
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High efficiency and Energy saving, Save power and to help cut greenhouse gas emission
As a rule, LED bulbs use 60% to 90% less electricity than traditional bulbs. LEDs create a very efficient light source as they convert almost all the energy used into light. Reduce carbon emissions. LED lights are very efficient as compared to other lighting products. Using LED lighting helps reduce greenhouse gas emissions.
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Long life Reduce replacement waste
Besides being extremely energy efficient, LED lighting has long lifespan reaches from 50,000 to 100,000 hours, compared to 1,000 hours for incandescent, and 8,000 hours for fluorescent and CFLs.Also, CFL may never be repaid, in these way, LED lighting will help to reduce replacement waste, save materials.
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Cold lighting source No harm radiation
LED light is a safer, healthier light. LED products offer advantages such as : no ultraviolet radiation and infrared, mercury-free, low heat emission, no heat radiation, low temperature light source. LED Bulbs burn very cool, while incandescent bulbs emit 98% percent of their energy as heat! Reduced air-condition energy consultation thanks to extremely low thermal output.