Làm thế nào để chọn được bóng đèn hoàn hảo cho chiếu sáng của bạn - Phần 1
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Japanlighting.com - How to Choose the Perfect Light Bulb for Your Lighting Fixture tạm dịch là: Làm thế nào để chọn được bóng đèn hoàn hảo cho chiếu sáng của bạn
Part 1: Understanding Light Bulb Basics
Phần 1: Hiểu biết cơ bản về bóng đèn
Even though light bulbs are fairly basic in function, there are so many options available that you can easily get lost. Rather than buying the first bulb that 'looks like it will work', take the time to find the perfect bulb for your fixture. You'll not only save money in the long run, you'll end up with the most attractive lighting for your home, and prevent a possible fire from using the wrong option.
1./ Look for the right wattage. The first thing to consider when matching a lightbulb to a light fixture is the wattage amount. Every light bulb has a matching wattage - the amount of energy it is capable of producing. This number will range anywhere from 40-watts to 120-watts for a traditional light fixture. On the flip side, every light fixture has a maximum wattage amount. This is the highest wattage the fixture is capable of using without becoming a fire hazard (it can’t handle a high wattage). You therefore need to choose a light bulb with a wattage amount that is equal to or less than the maximum wattage on your fixture.
- Using a light bulb with wattage above the maximum that the fixture can handle is a major fire hazard.
- You can use a light bulb with wattage less than what your fixture asks for.
2./ Pay attention to the lumens. Lumens refers to the amount of light the bulb will put out (as opposed to wattage, which is the amount of energy). The higher number of lumens, the brighter the light bulb will be. Therefore, if you’re trying to illuminate a large space, you’ll want to use a light bulb with a high number of lumens (above 1000). A small fixture or table lamp does not require a bulb with a high number of lumens.
- The more lumens, the closer the appearance of the light is to that of natural sunlight.
3./ Look at the shape of the bulb. There are many different shapes of light bulbs, each with a different use. The most commonly used bulbs are the generic ‘bulb’ shape, the spiral shape, and the A shape. Additionally, there are drop shaped, globe shaped, flame shaped, tubes, and more varieties of bulbs. Generally the shape doesn’t really matter, but some light fixtures require a specifically shaped bulb in order to work or appear correctly. Check your fixture first, and then look for bulbs that match.
- Make sure to check the socket type and size of your lighting fixture so that you know what light bulbs you need.
- There are 4 commonly used thread size groups for mains supply lamps: Candelabra - E12 North America, E11 in Europe; Intermediate - E17 North America, E14 (Small ES, SES) in Europe; medium or standard - E26 (MES) in North America, E27 (ES) in Europe; Mogul - Mogul: E39 North America, E40 (Goliath ES) in Europe.
- The number after the E refers to the external diameter of the light bulb's thread in millimeters. For example, E27 means that the external diameter of the thread is 27 millimeters.
4./ Check the ‘life expectancy’ of the light bulb. All light bulbs are not created equal; in fact, some bulbs last quite a long time, while others will only remain lit for a few months or years of use. Each bulb should say on the back what the life expectancy is, normally based on three hours of use a day. If you’re putting the bulb in a well-used fixture, it will do you good to find a bulb that has a longer life expectancy than a bulb that goes in a rarely-used lamp.
- Incandescent bulbs generally have the shortest life expectancy.
- Halogen bulbs are cheap upgrades over traditional incandescent bulbs, having improved efficiency and lifespan with only a small increase in price.
- Compact fluorescent bulbs have a lifespan that is several times better than an incandescent light bulb but the lifespan is reduced significantly if the bulb is switched on and off frequently.
- LED bulbs have arguably the longest lifespan of all light bulbs, several times better than an incandescent light bulb and significantly better than most fluorescent bulbs. Manufacturers are giving long warranties to confirm the long lifespan of LED bulbs, typically 15,000 hours (15 years at 3 hours/day), and to support 50,000 switch cycles.
5./ Make note of the ‘light appearance’ of the bulb. Most bulbs will advertise the ‘light appearance’ on the package - this tells you how warm or cold the color of the light is. Light appearance that is on the warm side will be more orange/yellow, while light appearance that is on the cold side will be more blue/white. Although this may not be a serious consideration for you when choosing your bulbs, you might want to make sure you don’t accidentally purchase a bright white bulb when you intended to buy a warm yellow bulb.
- Light appearance is measured in temperature using the Kelvin scale. Color temperatures in the range 2700K–3000K are considered "warm white". 3500K-4500K would be "neutral white", sometimes called "bright white", over 5000K would be "cool white" or "daylight". (These names are approximate descriptions. Lower color temperatures are warmer/yellower; higher temperatures are cooler/bluer).
6./ Look at the energy cost of the bulb. Besides the initial cost of the light bulb, there is an additional overall energy cost associated with the bulb. This is the price you will pay in electricity bills for the one bulb over its lifetime. Energy efficient light bulbs will cost much less over their lifetimes than will traditional light bulbs. When possible, you’ll want to choose bulbs that have a low lifetime cost. This may mean paying a bit more up front, but you’ll reap the benefits down the road.
7./ Check the mercury content of the light bulb. The mercury content of the bulb doesn’t affect the light or overall use of the bulb; the only thing a bulb that contains mercury will do is prevent you from throwing it away. If your bulb has any mercury in it at all, it cannot be disposed of in the trash. Now, mostly screw-in CFL bulbs contain mercury, but you should check all bulbs you purchase just in case.
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Tổng hợp: Japanlighting.com