What are some key disadvantages of infrared LANs?

What is a good reason of not using infraed LAN?
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"(1) Many indoor environments experience rather intense infrared background radiation, from sunlight and indoor lighting. This ambient radiation appears as noise in an infrared receiver, requiring the use of transmitters of higher power than would otherwise be required and also limiting the range. (2) Increases in transmitter power are limited by concerns of eye safety and excessive power consumption."
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The facility is restricted because of protection factors.
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