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why do we need the light bulb

incandescent light bulb ' halogen lamp' - a type of light bulb that includes the. - previously only used for low-power places, they are now able to be used as light bulbs in the house
lamp, the earliest kind, now rare except in big searchlights Light bulbs convert electricity into light and heat. Except for, the heat is considered waste. A light bulb that produces more light and less heat is more efficient. The incandescent light bulb turns electricity into light by sending the electric current through a thin wire called a filament. are made up mostly of, a metal. The of the filament heats the bulb up. Eventually the filament gets so hot that it glows, producing light. The filament needs to be protected from oxygen in the air, so it is inside the bulb, and the air in the bulb is either removed (a ) or more often, replaced with a gas that doesn't affect anything, like or argon. Only about 3% of the energy that goes into an incandescent light bulb actually makes light, the rest makes heat. That's one of the reasons LED's are more efficient. This is the type of light bulb that spent so much time on in the 1870s. It was the first light bulb that could be used in houses - it did not cost too much, and it worked well. For the first time, people did not have to burn something (candles, lamps, etc. ) to make light.

It was bright enough that people could read easily at night or do work. It was used to light stores and streets, and could travel around after dark. This started the common use of electricity in homes and businesses. filaments, developed in the 1900s, last longer and make a brighter light. They quickly replaced carbon ones. are efficient, and only give off l the amount of heat of an incandescent. They also last longer than incandescent but until the late 20th century were much bigger and did not fit into sockets for small overhead lights and lamps like an incandescent could. A fluorescent bulb is a glass tube usually filled with gas and a little bit of. When turned on, the cathode heats up and sends out. These hit the argon gas and the mercury. The argon gas makes a which lets the electrons move around better. When the electrons hit a mercury it puts the molecule into a state where it has a lot of energy (stores the energy). The energetic state doesn't last very long, and when the energy is released, it lets out a photon. from mercury are not visible like some other photons; they are. So there's a coating on the wall of the bulb. When the photon hits a phosphor molecule, it in turn puts that molecule into an excited state.

When this phosphor releases energy, it lets out a photon that we can see, and light is made. Changing the type of phosphor can change the color we see, but usually fluorescent light bulbs are whiter than incandescent light bulbs, which are slightly yellow. An LED is made like. It's a chip of material. LED bulbs are more efficient and last much longer than either incandescent or fluorescent bulbs. Unlike fluorescent bulbs, LEDs do not use mercury, which is toxic. For several years LED bulbs were not as bright as the other kinds of lights, and cost more too. Playbulb's Bluetooth Smart LED light bulb is also a speaker! Smart bulbs aren't your average LED. They don't just sit in a socket and light a room like your basic bulb. That's boring. Smart bulbs can do so much more. are called smart for a reason. They can wirelessly connect with phone apps, a capability that opens up major possibilities. Here are just a few things smart bulbs can do. One of the basic features of smart bulbs is that you can dim many of them without having to install dimmer switches in your home. Simply screw a dimmable smart bulb into your lamps or chandeliers and dim or brighten them using the bulb's corresponding app. Choosing the right dimmable bulb for your home is key, though.

Here's Taylor Martin's tips for. Some smart bulbs, such as the, have scheduling features which let you control your lights when you aren't home. This is a great security option for when you're on vacation, because your home never looks empty. It also means you can come home to a lit house without leaving your lights on and wasting electricity. Most light brands offer a hub that can sync all of your lights together so you can control all of them with one app. Dimming the lights to set a mood is fine, but you can take it a step further. Many smart bulbs also change color. In fact, some, including the, can produce a range of over 16 million colors. You can select the exact color you want by tapping a color wheel in the bulb's app. With the, Siri can even change your lighting whenever you ask. Why would you want a bulb that changes color? Want to warm up the feel of a room? Change your light color to a golden yellow. Want to cool it down? Change your light color to light blue. During parties you can match the theme's color with your lighting. During the holidays you can turn your smart bulbs red and green for Christmas, black, red and green for Kwanzaa or blue for Hanukkah. Hate your wall color? Change it without painting by adding a little blue, yellow or red hue with a low intensity setting to your everyday lighting.

Imagine not having speaker wires everywhere, but still being able to hear your tunes in any room of the house. Smart bulbs with built-in speakers can make it happen. For example, the has lights that pulsate and change colors to match the mood of the music coming out of its speakers. It's like a party in a bulb. P In my experience, the only problem with this bulb is that it isn't very loud. You really can't hear it if you're walking from room to room. It's perfect for a teen's bedroom, though. If you want better sound quality and don't want colorful lights, the is a great choice. It offers high-quality audio and is also dimmable. Smart bulbs can even help you sleep better. The emits several color temperatures that are designed to help regulate natural melatonin production in the body. Its light settings help suppress your melatonin levels during the day and increase melatonin as you get near bedtime. is another bulb that emits soothing light that doesn't interrupt your natural circadian rhythm. Read more: Here's our list of the. Update, Jan. 5: This article was originally published in 2015 and has been updated with new links and information.

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