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By the time you reach 75 years old, you will need four times as much light as a 20 year old, in order to see satisfactorily INCANDESCENT, full spectrum is the most desirable type of light. It can be achieved with energy efficient “T” series FLORSCENT bulbs with a high color rendering index (CRI) 90-100. For bulb selection 1. you need to know the dimensions of the room; 2. how BRIGHT you want room lighted as measured in LUX; 3. the COLOR of light in KELVIN; 4. and the QUALITY of the light measured by the color rendering (CRI) index. 5. select the appropriate bulb and note how many LUMENS of light it will produce. Then calculate the number of florescent bulbs with the your CRI rating as necessary to accomplish the task and with power consumption in mind (WATTS), select the type of fixture. LUX (Lx) BRIGHTNESS IN LUX One Lux - is one lumen per square meter. 3.4 lux - twilight 50 lux - living room 80 lux - office hallway 100 lux - overcast day 350-500 lux - office lighting 400 lux - sunrise 1000 lux - overcast day 10,000-25,000 - daylight 32,000-130,000 - sunlight KELVIN (K) is the COLOR of the LIGHT called COLOR TEMPERATURE 3000K – warm white 4200K – cool white 5000K - daylight 2700 K - residential lighting (Incandescent light) 3000-3500 K - neutral-white 4100 K - cool-white in offices 5000-6500 K - blueish-white CRI is the QUALITY of the light called the COLOR RENDERING INDEX and is a measure of how well colors can be perceived. 100 CRI - incandescent lamp 50-100 CRI - fluorescent tubes 82-100 CRI - natural color (full spectrum) POWER CONSUMPTION as measured in Watts. Incandescent lights are full spectrum but are energy hogs. Florescent lighting is more energy efficient. The high efficiency bulbs are labeled with “T” - T12, T8, T5 etc..."T" is the diameter of the tube in the lamp. Typically narrower the lamp diameter the more efficient it will be. T12’s have not bee manufactured since 2012. Seniors - Printed materials are not as clear as before, in part because the lens in your eye becomes less flexible with time. Changes within the lens in your eye cause light entering the eye to be scattered rather than focused precisely on the retina, thus creating more glare. The normally clear lens located inside your eye may start to discolor making it harder to see and distinguish between certain shades of colors. The tear glands in your eyes will produce fewer tears. Increasing the the amount of light, brightness called LUX can improve vision. Bright Light Therapy - is used to gradually shift sleeping patterns to what we consider normal. For treatment, the timing of light exposure uses a full-spectrum light (90-100 CRI) usually 10,000 LUX in intensity, for 30-90 minutes. Blue wavelengths -- boost attention, reaction times, and mood are about 5000 degrees Kelvin. As published in the The Journal of the American Medical Association researchers learned that bright light resulted in a modest improvement in dementia symptoms. Specifically, the use of bright daytime lighting: · Reduced cognitive decline on a mental status exam by a relative 5%. · Cut depression symptoms by a relative 19%. · Calmed slow increases in functional limitations by slightly more than half (53%). Dementia and Alzheimer's - For these people shadows in a darkened room can become something else, often menacing, and can lead to confusion and depression. A dark rug in a dimly lighted room before a door may become a deep well. I installed 800 LUX of light – when I throw the light switch, I feel a burst of energy like I am waking up and my mind becoming clear.

David Gray Project #5 | 6 Reviewers | 2014/11/10 12:00:00 SA | Rating: 2.8