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Explain it breif

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Here's a brief explanation of this chapter on Operation Theatre (OT) Lights:
Why needed: General room light isn't enough to see fine surgical detail, so special OT lights are used in addition.
Two main types:
  1. Ceiling suspended light (major light)
    • Gives collective illumination of ~70,000 to 1 lac lux (varies with surgery needs)
    • Shadow-less light, keeps the operative field clear
    • "Cold" light - doesn't raise temperature or dry out the tissue/field
    • Intensity can be focused, adjusted, and rotated (spring-balance mechanism)
    • Some have a detachable, sterilizable central handle so the surgeon can reposition it himself
    • Modern versions have a camera attached to record/stream the surgery
    • "Satellite" versions have two domes (one main + one smaller satellite head, e.g. 7 bulbs + 4 bulbs)
  2. Sidelight / mobile light
    • Portable, can be moved between rooms/tables
    • Lower intensity: ~30,000 to 70,000 lux
    • Often halogen, LED, or Xenon bulbs
    • May also have an autoclavable handle
When satellite/extra lights are useful:
  • Gynae surgery
  • Operations below the abdomen
  • When two tables are side by side
  • When more light is needed
  • When surgery is done simultaneously on two body parts
Care of OT lights:
  • Switch off when not in use
  • Clean surface with a wet cloth + detergent (avoid carbolic/phenolic cleaners)
  • Get serviced regularly by authorized technicians, with servicing records maintained
  • Keep a stock of spare bulbs available
In short: ceiling lights are the primary, high-intensity, shadow-free source for the main operative field, while mobile sidelights supplement lighting for extra visibility or additional simultaneous procedures.
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