LED bulbs last longer and are more efficient than other technologies. Selection of suitable bulbs is becoming increasingly important .Here are some strategies to keep in mind to help you select correct bulbs for the light fixtures in your home.
1、Choosing a Bulb That Fits-Bases and Shapes
The bulb's cap or connector is the base of the bulb that plugs or screws into the fixture's fitting or socket. Look at your fixture to determine its base type. Screw in base is also known as the 'Edison screw', which is the most common light bulb base, including lamps, Chandeliers, are going to have one of the three base types shown below.
Usually the manufacturer use a code number to define the bulb's shape which consists of a letter or letters followed by a number. such as A-19, the mosts commonly used household bulb. The bulb is 'A' type and the diameter would be 2-3/8"=19*1/8. See the figure below for a detailed illustration of the different types of light bulbs.
Below one is the the typical A19 LED bulb with UL certification.
Choosing The Right Bulb For Your Home by fixture
2、Light Appearance-Color Temperature,Brightness,CRI
Color temperature is measured in Kelvin (K), and there are three common ranges.Warm white is also known as Soft White (2700K-3500K)，which is cozy, inviting warm glow，best for dining room, bedroom. Cool White is also known as Neutral White (3500K-4100K),which is clean, efficient, radiant glow, ideal for kitchen, basement, bathroom, garage.Daylight (5000K-6500K) is alert, active, vibrant glow. use for display areas, home offices.
BRIGHTNESS （Lumens or Watts）
Higher wattage doesn't always mean a brighter light bulb. To choose a light bulb with the right brightness, look for lumens, not Watts. If you wanted a brighter bulb you'd simply choose one with more Watts of traditional tech. bulbs. For example, most 60W bulbs – put out about the same amount light.
Lumens give a measure of the amount of light – the brightness – produced by a light bulb. Whether it's a CFL, LED, halogen, fluoro or incandescent bulb, the bigger the number, the brighter the bulb. If you want a brighter light bulb, choose one with more lumens.
If you aren't sure how many lumens you need to suits for your space – and are still accustomed to buy bulbs by Wattage – you can use the conversion table below to work it out.
Some light bulb packages display an 'equivalent' Wattage figure. This refers to incandescent bulbs. For example, an 700 lm LED may state it's equivalent to – in brightness – a 60 W incandescent. However, a quality LED uses as little as 7W of energy to produce this, making it a lot more efficient.
CRI (color rendering index)
The Color Rendering Index (CRI) is an indicator of how accurately color can be distinguished under a light source.
A CRI of 100 is considered excellent, however for general lighting purposes you can use a bulb with a CRI around 80. If the light bulb is being used in tasks where the color is important, such as painting, look for a bulb with a CRI of 90 or more.