5 to 5 sentence for L.E.D tv and mobile phone
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LED TV is a type of LCD television that uses light-emitting diodes (LEDs) to backlight the display instead of the cold cathode fluorescent lights (CCFLs) used in standard LCD televisions.
Older LCD TVs used cold cathode fluorescent lamps (CCFLs) to provide backlighting, whereas LED-backlit LCD TVs used an array of smaller, more efficient light-emitting diodes (LEDs) to illuminate the screen. As the technology is better, all LCD TVs now use LED lights and are colloquially considered LED TVs.The theoretical lifespan of a modern TV is around 60,000-100,000 hours. Well, among all TVs, plasmas are considered to have the longest lifespan. Normally, a plasma should last longer than both an LCD and an LED, with only a few exceptions.
Mobile phones are used for a variety of purposes, such as keeping in touch with family members, for conducting business, and in order to have access to a telephone in the event of an emergency. Some people carry more than one mobile phone for different purposes, such as for business and personal use. Evidence so far suggests that mobile phones aren't harmful, but long-term risks and consequences are yet to be clarified. If you are concerned, you can reduce your exposure to RF radiation by: ... not carrying your mobile phone close to your body when it is switched on.
Under 2 hours a day is medically recommended, but it is a good idea to limit this time during weekdays so you can focus on academic studies