برق. قدرت. کنترل. الکترونیک. مخابرات. تاسیسات.

دایره المعارف تاسیسات برق (اطلاعات عمومی برق)

What should you know about glare?

Glare is a common lighting problem. Glare is what happens when a bright light source or reflection interferes with how you are 'seeing' an object. In most cases, your eyes will adapt to the brightest level of light. When this adaptation happens, it becomes harder to see the details in the duller or darker areas of the work space (even though they are actually sufficiently lit!). Glare can cause annoyance and discomfort, and can actually decrease a person's ability to see.

Reflected glare is caused by:

  • Light reflected from polished, shiny or glossy surfaces.
  • Glass on picture frames, or windows at night.
  • Monitors / screens.

Direct glare is caused by:

  • Very bright light from poorly positioned light fixtures.
  • Sunlight.

Direct glare


How do you detect glare?

There are several ways to find sources of glare.

  • When in your normal working position, look at a distant object at eye level. Block the light "path" from the fixtures with a book or cardboard. If the distant object is now easier to see, the light fixtures are probably producing glare.

Detecting glare

  • To detect reflected glare, look at the task from your normal working position. Block the light falling on it from the front or above. If details are now easier to see, reflections are a problem.

Reflected glare

  • Place a small mirror face up on the work surface. If the mirror reflects light from above, the light fixture is responsible for glare.
  • Look for shiny objects that reflect light. Glass in picture frames, glossy table tops and monitors or screens are common examples.
  • Ask workers if they experience sore or tired eyes, headaches or if they need to squint to see.


How do you correct glare problems?

To correct glare, try:

  • Using several small low-intensity light fixtures rather than one large high-intensity light fixture.
  • Using light fixtures that diffuse or concentrate light well. Indirect light fixtures or direct light fixtures with parabolic louvres are two possibilities.
  • Covering bare bulbs with louvers, lenses or other devices to control light.
  • Increasing the brightness of the area around the glare source.
  • Using adjustable local lighting with brightness controls.
  • Positioning light fixtures to reduce reflected light that is directed toward the eyes.

Positioning light fixtures to reduce reflected light that is directed toward the eyes

  • Using low gloss paper or applying flat or semi-gloss paint and matte finishes on 'offending' surfaces. Removing highly polished and shiny objects.
  • Keeping general lighting levels at recommended levels.
  • Positioning the work station so that windows and fluorescent light tubes are parallel to the worker's line of sight.
  • Position the work station so that the light fixtures are NOT in the front or directly overhead.

~

صفحات جانبی

نظرسنجی

    لطفاً نظرات خود را درمورد وبلاگ با اینجانب در میان بگذارید.(iman.sariri@yahoo.com)نتایج تاکنون15000مفید و 125غیرمفید. با سپاس


  • آخرین پستها

آمار وبلاگ

  • کل بازدید :
  • تعداد نویسندگان :
  • تعداد کل پست ها :
  • آخرین بازدید :
  • آخرین بروز رسانی :