Deaf – mute is a term which was used to identify a person who waseither deaf using sign language or both deaf and could not speak .There are three basic types of hearing loss:1- Conductive hearing loss.2- Sensorineural hearing loss.3- mixed hearing loss.Because they used to depends on Sound localizationSound localization is the ability to tell the direction fromwhich a sound is originating? Because they depend on lip reading so they need goodlightingIdeally the building should be:? oriented to the sun to maximize natural daylighting potential? minimize morning and late afternoon glare from sun low on the east and west skiesprevent excessive solar heating on the west side of buildings.The sun path diagram for Rockville .Provides information for determiningnecessary lengths of sunshades,cantilevers, and window placementand heights to take best advantage ofnatural light.Electric light lamps should be low glare & avoid anyflicker and unwanted noise.From that point of view:? fluorescent lamp should be avoided? LED lamp which simulate daylight, give homogeneouslighting and have higher efficiency & longer lifeexpectancy is advisable? Electric dimmers can provide better control inlighting level.Glare is difficulty seeing in the presence of bright light? They cause discomfort and reduced visibility? We have two type of glare : discomfort and disability? Also we have : direct glare and indirect glareDisability glare results in reduced visualperformance with excessive luminance leading toa loos a visibility .? You can not complete your work in this case.? The problem with disability glare is that it reducecontrast, causing a washing out- the whole sceneslooks grey.Discomfort glare occurs naturally when a light source is toostrong for the eyes but in this case you can complete your work.? Physical parameters that determine the degree of discomfort :- Luminance of the glare source- Background luminance- Size of the glare- Position of the sourceDirect glare is caused as a result of high luminancefrom a light source .Indirect or reflected glare? Reflected glare is result from the reflection of highbrightness smooth surfaces .Direct glare is caused as a result of high luminancefrom a light source .Indirect or reflected glare? Reflected glare is result from the reflection of highbrightness smooth surfaces .Color on walls and carpeting can enhance or hinder visual communicationwhen it is too bright or dark.long-lasting, have a rated life more than 11 years .? Do not need a lot of maintenance? light up the place overall? they never burn out , actually they do not completely burn out makes them a muchsafer option for emergency lighting.? more durable than traditional bulbs, meaning they’re less likely to break.? they do not emit UV rays , so they do not attract insects

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