Why do home LED lightbulbs have so much heat on heatsink yet devices like iPhone that use LED lighting seem to have very little

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Why do home LED lightbulbs have so much heat on heatsink yet devices like iPhone that use LED lighting seem to have very little

In: Engineering

Because a LED bulb with a heat sink will emit many time more light then the screen of a iPhone. A low power LED bulb do not need a heat sink.

Just try to illuminate a wall in a dark room with the screen and compare that to a light bulb.

There might be a difference in efficiency and the phone product less heat for the same amount of light and that is because how you it is constructed so you can run a LEDs on mains voltage versus the battery in a cellphone. A LED bulb often is made as cheap as possible but the cellphone charger and voltage converter in the phone is more advances, expensive and efficent. But the main difference it still the amount of light they emit.

LED bulbs use much more energy, and so produce much more heat. A typical LED bulb consumes about 10 watts. If an iPhone consumed that much power, it would run out of battery in less than an hour.

https://www.1000bulbs.com/category/60-watt-equal-led-light-bulbs/
https://www.computerworld.com/article/3120947/7-things-we-learned-about-iphone-7-today.html

Since the LED bulbs can convert 80% the energy to light. But the iphone can not. Now most of the led product like this https://yahamlighting.com/products/led-high-bay-light/turbo.html can save the heat energy which can save the cost.