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full spectrum lighting vs. incandescent
Is there any possible difference - even theoretical - between the two types of lighting in terms of risk to retina (I have atrophic myopic degeneration). Does full spectrum lighting contain more blue light?
I am having a horrible time with the new lighting at my workplace, and it just went from 3000k to 4100k. Just that rise in color temperature has been enough to severely affect my body. Whenever I'm under the lights my eyes first start to burn, like they are on fire, eyedrops don't help. Then, after another hour or so I start feeling lethargic, and nauseous, mixed with an eye ache and head pain. It feels like you have the flu, cumulating throughout the day. Then I get home, and after some time under normal 'soft white' lights, even if they are fluorescent, I am fine. I wish someone could tell me why my body has such an adverse reaction to this particular kind of light.
Another thing, since these lights...and being under them so much of my week, I have developed more sensitivity to other kinds of fluorescent light. I never had a problem before in 'big box' stores, but now I can't stay in them more than a few minutes before I start feeling 'symptomatic'.
The Drs and scientists need to get on this!
Another thing, since these lights...and being under them so much of my week, I have developed more sensitivity to other kinds of fluorescent light. I never had a problem before in 'big box' stores, but now I can't stay in them more than a few minutes before I start feeling 'symptomatic'.
The Drs and scientists need to get on this!
see ****.***. I use only full spectrum throughout the house,--including the study.I take them with me when I am away from home.
Full spectrum bulbs fit in any lamp, fixture. They even have chandelier bulbs. They create beautiful, flattering scenes and are not glaring and yellow.
Here is a link to some basic terms in lighting: www.eere.energy.gov/consumer/your_home/lighting_daylighting/index.cfm/mytopic=11990
We know eyesight deteriorates with age, slowly at first and then at a rapidly increasing rate. A 50 yr old needs four times the amount of light needed by a 20 yr old to achieve the same level of visual efficiency for the same task.
Glare can be disability glare or discomfort glare, and can incur visual fatigue. Disability glare occurs when bright light source is close to the line of vision and makes task more difficult to see. One example of disability glare is that of a car headlamp on main beam in unlit environment. Adjusting the beam down and away from the observer will reduce the effect, as will reducing the beam intensity i.e. dipping the headlight.
By altering the geometry so that the light source reflections are not directed along the line of vision, using lighting with lower illuminance, screening the source, or changing the source surface to one with more diffuse properties are some of the ways. Further relief may be obtained by lighting the background environment i.e. reducing the contrast between the source and background. These are general guidelines. Hope it helps.
We know eyesight deteriorates with age, slowly at first and then at a rapidly increasing rate. A 50 yr old needs four times the amount of light needed by a 20 yr old to achieve the same level of visual efficiency for the same task.
Glare can be disability glare or discomfort glare, and can incur visual fatigue. Disability glare occurs when bright light source is close to the line of vision and makes task more difficult to see. One example of disability glare is that of a car headlamp on main beam in unlit environment. Adjusting the beam down and away from the observer will reduce the effect, as will reducing the beam intensity i.e. dipping the headlight.
By altering the geometry so that the light source reflections are not directed along the line of vision, using lighting with lower illuminance, screening the source, or changing the source surface to one with more diffuse properties are some of the ways. Further relief may be obtained by lighting the background environment i.e. reducing the contrast between the source and background. These are general guidelines. Hope it helps.
Can you recommend which type of lamp uses the least amount of blue light and has the least amount of "glare." Cost and efficiency are not my concern. I'm looking for lighting which will minimize risk to my retina as well as reduce my photophobia, yet still allow me to see the clearest.
From engineer's perpective, incandescent is the least energy efficient light. Fluorescent lighting is the most efficient and cost effctive. Get compact fluorescent lamps (CFL) where possible. CFL uses 75% less energy and can last more than ten times longer than incandescent lamps.
Full spectrum lamps are fluorescent lamps but they much more costly than regular lamps, and they require more electricity for a given light output. This is because it has a higher CRI (Color Rendering Index) of 90. A light source with CRI rating of 100 has the same color rendering qualities as sunlight. The higher the CRI the more expensive it is.
Most lamps fall in the range of 2200 to 7500 K. The lower a lamp’s Kelvin rating or chromaticity, the more it will create a visually “warm” atmosphere. Many people prefer to use these “warm white” lamps in their homes, because they create coloration which is psychologically warm and restful.
Full spectrum lighting has a color temperature of 5000 K. The higher a lamp is rated on the Kelvin scale the “cooler” it will appear, creating bluish tones, though some people find them harsh or uncomplimentary.
Full spectrum lamps are fluorescent lamps but they much more costly than regular lamps, and they require more electricity for a given light output. This is because it has a higher CRI (Color Rendering Index) of 90. A light source with CRI rating of 100 has the same color rendering qualities as sunlight. The higher the CRI the more expensive it is.
Most lamps fall in the range of 2200 to 7500 K. The lower a lamp’s Kelvin rating or chromaticity, the more it will create a visually “warm” atmosphere. Many people prefer to use these “warm white” lamps in their homes, because they create coloration which is psychologically warm and restful.
Full spectrum lighting has a color temperature of 5000 K. The higher a lamp is rated on the Kelvin scale the “cooler” it will appear, creating bluish tones, though some people find them harsh or uncomplimentary.
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