Do Light Bulbs Get Hot?
Do light bulbs get hot? Light bulbs, sometimes defined as miniature heaters that produce a trace of light, are a core of expensive modern comfort. From the digital time display on our coffee makers to the nine-bulb chandelier above the dining table, light bulbs enhance our quality of life. They also squander our national output of electricity. Thank Thomas Edison for deliverance from a literal dark age. Thank him also for the power hungry nature of the incandescent bulb.
Why Light Bulbs Give Off Heat
Energy is the means by which we perform work. The measure of energy is determined by the quantity of work produced. Work involves change: sometimes so simple as the blinking of an eye (not that I discount this awesome miracle), other times so complex as the lifting of a space shuttle. Though greater work requirements should involve an increase in energy demands, the process of waste reflects upon the actual work produced.
The reason why light bulbs give off heat releates to how they use energy. Energy usage typically fits into five main work groups: light, heat, motion, growth, and technology. For our concerns, we focus on light (radiant) energy and heat (thermal) energy, both of which are produced when an electric current is applied to light bulbs.
Light is a product of the collision between electrons and atoms. So too is heat. When an electric current is applied to the wires and filament of a light bulb, free electrons move from a negatively charged neighborhood to a positively charged neighborhood. During the course of movement (work), the electrons collide with the atoms that make up the light filament. This collision causes the atoms to vibrate (more work). Vibrating atoms heat up. The bound electrons (those linked directly to the vibrating atom) are boosted to a higher energy level. As these elevated electrons settle back to their normal energy state, they release excess energy in the form of photons (light).
The electron to atom collision will produce both light and heat. The effectiveness of a light bulb is measured by the ratio of heat versus light. The ratio is poor. Light bulbs squander power, producing very little work for the quantity of energy input. In effect, the greater the heat output the less efficient the light bulb. It is the product of current light bulb designs; by default, the bulbs draw more energy than is necessary for the lighting.
The Ongoing Cost of Current Light Bulb Technology
Light bulbs have long been an inefficient product. But like so many goods that linger in past technology, the incandescent bulb has, until recently, remained without updates. It is one those easy to slide issues. The light bulb, a small energy glutton so common as to be ignored by the average homeowner, has spent years eating you out of house and home. Consider the costs:
- Only ten percent of the applied electricity is converted to light. It takes ten bulbs to see what should be the work of one.
- Ninety percent of the applied electricity is dispersed in wasted heat. Touch an old incandescent. It will burn your finger, but do little toward heating a room.
- Lighting accounts for twenty-two percent of the US generated electricity. At one hundred percent efficiency per light bulb, this figure would be more like two percent.
- Eleven percent of your household energy bill is due to home lighting usage. Imagine the savings result of a mere fifty percent performance increase.
- Compact fluorescent bulbs use 50 to 75 percent less energy than do incandescent light bulbs. You aren�t waiting to make the switch, are you?
- Light-emitting diodes (LED) use only two watts as compared to conventional bulbs squandering away forty to one hundred watts. The higher cost is easily offset by the increased output.
A Few Additional Options
Due to a greater light output combined with a reasonable purchase cost, Halogen lamps have proven to be popular incandescent replacements. But when asking do light bulbs get hot? Consider Halogen to be some of the most heated. These bulbs, sometimes called a torch lamp, can exceed 1000 degrees Fahrenheit. Use them with great care. Combustible items should be kept far away. Some universities have actually prohibited the dormitory and other student housing use of halogen lamps.
Alternatively, utilize of LED lights is on the increase. By using the majority of the inputted current, LED lights are very energy efficient, producing brighter lighting while reducing heat waste.
Do light bulbs get hot? Not so much as they used too. Incandescent bulbs are still fireballs. Halogen lamps are like miniature suns. Compact fluorescent bulbs and LED lights are usually gentle on the hands. Lasers we leave for another discussion.
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