Environment: light
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This document discusses light and its properties, measurement, sources, and effects. It covers various types of artificial lighting like tungsten, halogen, fluorescent, and high density discharge lamps. Tungsten lighting uses a heated filament and is cheap but not suitable for large areas. Halogen bulbs have longer life and are brighter but more expensive. Fluorescent tubes provide cheaper and longer lasting light but require complex connections. High density discharge lamps are very bright but expensive and can cause glare. LEDs are most efficient but also expensive.
Environment: light
- 1. Dr. Rahul B. Pandit Faculty of Nursing Sassoon General Hospital, Pune ENVIRONMENT : LIGHT
- 2. • All living organism need light energy to survive. INTRODUCTION
- 3. Amplitude Wave speed Wave length Frequency PROPERTIES
- 4. Sufficient Distribution Absence of glare Absence of sharp shadow Steadiness Color of light Surrounding REQUIREMENTS
- 5. Luminous intensity Luminous flux Illumination Brightness or liminance MEASUREMENT OF LIGHT
- 6. Visible sky Reflection Natural light Planning of house Removal of obstruction windows and door Interior of room SOURCES OF LIGHT
- 7. Man made light For human to function properly It is required when day light is not effective All artificial light can be turn on off with switch. ARTIFICIAL LIGHTING
- 8. 1. It cause degradation of bilirubin. 2. Stimulate production of melanin in skin and vitamin D 3. Increases food comsumption. BIOLOGICAL EFFECT OF LIGHTING
- 9. Tungsten lighting Halogen lighting Fluorescent lighting High density discharge lamp METHODS OF LIGHTING
- 10. Invented by Thomas Edison Used tungsten filament Electricity passes to filament it gets heated up and produce light. Advantages • Cheap and easily available • Suitable for small area • Safe handling Disadvantages • Not suitable for large area TUNGSTEN LIGHTING
- 11. • This is incandescent bulb uses halogen gas. • Halogen gas increases the light output Advantages • Easy to handle • Longer life • Brighter that tungsten bulb Disadvantages • Expensive • UV ray damage collagen fibers of the skin. • Continuous exposure lead to formation of cataract. HALOGEN BULB
- 12. • It is narrow long glass tube. • This tube filled with gas argon, eon or krypton • White light Advantages • Cheaper • Long life • Now a days colorful Disadvantages • Complex connection FLUORESCENT LIGHTING
- 13. • High Density Discharge Lamp widely used in stores, street. Advantages • Brighter Disadvantages • Glare • Expensive HIGH DENSITY DISCHARGE LAMP
- 14. • It is most efficient form of lighting • Very economical • Long lasting • Produce more light • Expensive • LED contain arsenic and other harmful substances. LIGHT EMITTING DIODES