LED Bulbs Manufacturer Tell you How to Choose LED Light Bulbs

New features and new trends in intelligent lighting
2018年4月2日
LED Bulbs Wholesale Supplier with Good Reputation in China
2018年4月24日
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LED Bulbs Manufacturer Tell you How to Choose LED Light Bulbs

NVT Lighting is a leading 360 degree LED bulb manufacturer in China. We owns advanced equipment to produce high quality 360 Degree LED Bulbs, omnidirectional LED bulb, A19 LED Bulbs, T5 LED Tubes, mr16 LED bulbs,LED candle bulb, LED filament bulb, and many more LED bulbs products. And we have staffed with professional LED light bulbs experts and highly experienced workers on development and production lines. Good quality and competitive price make our company earn high reputation in home market and abroad. Today, we would like to tell you how to buy LED light bulbs:

In many ways, buying LED light bulbs is just as buying traditional light bulbs. Because they both offer the same bases and caps and are available in similar shapes and colors. However, while there is a lot of overlap between LED bulbs and traditional bulbs, there are still a few of key differences you should keep in mind, such as:

  • Your light fixture’s base type
  • Bulb shape
  • Beam angle
  • Brightness
  • Colour temperature
  • Bulb placement

Let’s take a closer look at the most important factors that will affect your purchase decision:

LED BULBS BASE TYPE

The cap or base joins the light bulb to the socket in order to provide an electrical connection and power your bulbs. While choosing the right base may seem straightforward, purchasing the wrong base type is a very common mistake, so it’s important to know what type to look for before you buy.

There are 3 main types of bases:

led light bulbs Bayonet
This is the most commonly used base type in the UK, named for the push and twist action used by soldiers to mount bayonets to rifles. It has a smooth base with a pin on either side that slides into the cap as you insert the bulb into the socket, and expands again to lock the bulb in place.
led bulbs Screw
Also known as the Edison screw base (after the inventor), these bulbs have a threaded base that screws into the fixture to securely hold the bulb.
led bulbs Pin and push fit
Most domestic-use pin bulbs only have two pins, but they can have more. The length of the pins and the space between them dictates which fixtures they can be placed in. They are most commonly used for downlighting, track lighting and recessed lighting.

 

Bases are label LED using a coding system that follows a letter-number-letter format. Here is a quick breakdown of how it works:

  • First letter:Indicates the type of base, eg. screw or bayonet.
  • Number:Indicates the diameter of base or distance between pins, measured in mm.
  • Second letter: Indicates the number of pins or contacts, usually on architectural or striplights, but more often than not this letter is omitted.

To learn more about the different types of caps and bases and for a more in-depth look at the coding system, check out our guide.

LED BULBS SHAPE & BEAM ANGLE

LEDs are available in all of the standard light bulb shapes, so it’s easy to replace like for like. Sometimes the bottom of the bulb will look different – usually it has a metal or opaque plastic casing – because it is actually a heat sink. Otherwise, the shapes are easily recognizable:

 

Standard (A series, GLS)

Candle

led light bulbs

Golf Ball

led light bulbs

Globe

led light bulbs

Tubular

led light bulbs

Pear

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Reflector

led light bulbs

Capsule

led light bulbs

GU10/PAR16

led light bulbs

 

Which shape you should select depends on your fixture and what kind of atmosphere you’re trying to create. Some fixtures have specific size or shape requirements that you will need to accommodate, but beyond those limitations, consider your lamp and choose a bulb shape that compliments it.

The important thing to remember when selecting a bulb shape is that there are two types of light bulbs, each with a different beam angle: directional and omnidirectional:

  1. Directional: Light is focused in a specific direction, similar to a spotlight.
  2. Omnidirectional: Light is projected in all directions.

Usually you can tell which type of light a bulb emits by its shape; for example, shapes like reflectors and GU10 are typically directional, whereas standard and globe shapes are typically omnidirectional. However, with LEDs, sometimes the heat sink and other design elements of the light bulb limit the beam angle and create a directional bulb.

LIGHTING FACT: Any beam angle less than 360° is considered directional lighting.

There are benefits to both types of beam angles, but they don’t handle the same tasks equally. Each shape or style will emit a slightly different beam spread, which will affect its applications:

 

  DIRECTIONAL LED BULB OMNIDIRECTIONAL LED BULB
led bulbs omnidirectional led bulb
Common Shapes Reflector
GU10
PAR
Dichroic
Golf ball
Standard
Globe
Candle
Standard
Globe
Candle
Tubular
Pear
Golf ball
Beam Angle Range 359°≤ 360°
Ideal Uses Task lighting
Ceiling fans
Pendant lighting
Recessed lighting
Outdoor security lights
Downlights
Ambient lighting
Table lamps
Floor lamps
Sconces
Pendant lighting

 

As a general rule, narrower beam angles are well-suited for task lighting, whereas wider beam angles work well as ambient lighting. To see examples of what different beam angles look like in commercial and domestic settings, check out our Beam Angle Guide.

PRO TIP: On our website, the diameter and length of the bulb can be found under the specifications of each product page. On the package, diameter is sometimes listed as a code. The first letter indicates the shape, and the number that follows indicates the diameter of the widest part of the bulb in millimeters. For example, an A60 bulb would be an A series bulb with a diameter of 60mm.

LED BULBS BRIGHTNESS

When selecting an LED light bulb, remember that you are selecting brightness by the level of lumens (lm) a bulb has, not watts. Watts are a measurement of energy use, and since LEDs require much lower levels of energy to create the same level of brightness as incandescent or CFL bulbs, describing the level of brightness in terms of energy use is no longer accurate.

Learn more about lumens and watts – check out our conversion chart.

Like most of the options available for lighting, the level of brightness you want depends on what you will be doing. Bright light makes you more alert and attentive, making it ideal for task lighting, whereas a lower lumen level will create a more relaxing environment suitable for a bedroom or living room.

PRO TIP: Dimmers make an excellent addition to any room because they allow you to adjust the level of brightness to suit your current activities.

LED BULBS CORRELATED COLOUR TEMPERATURE

Correlated Colour Temperature (CCT), or simply “colour temperature”, describes an LED’s specific shade of white. The CCT is listed in degrees Kelvin: the higher the temperature, the cooler or more blue the colour appears. If you are looking for a warm white light, similar to the golden glow of a candle, you will want something lower than 3000k.

 

led bulbs

 

To learn more about colour temperature, check out our complete guide.

COLOUR RENDERING INDEX

The colour temperature of an LED light bulb is not an indication of how faithfully it renders colors – two LED bulbs that have the same CCT can display colors completely differently. Therefore, to determine a light bulb’s colour accuracy, you need to look at its Colour Rendering Index (CRI).

Developed and maintained by the International Commission on Illumination (also known as the CIE – Commission Internationale de l´Eclairage), CRI is a measurement of how well a light bulb illuminates an object’s true colors. It is the most difficult metric for CFL and LED light bulbs to replicate without sacrificing efficiency or brightness.

The CRI goes from 0 to 100.

 

0 Low, inaccurate. Bulbs that are very low on the CRI scale will usually make things appear green or magenta.
10
20
30
40
50
60 Reasonable.
70 Reasonable – acceptable for domestic use.
80 Good – acceptable for domestic use. Anything below 80 is considered mid-range to low.
90 Excellent CRI – the minimum for commercial or professional use.
100 Natural light – the standard for comparison.

CRI is not necessarily a top priority for home lighting applications, so it often gets left off of light bulb packaging. A lower CRI rating can appear different on different bulbs, and it doesn’t mean all of your colors will look dull or incorrect. For most commercially available light bulbs, the CRI will fall somewhere in the 70s or 80s, which is considered an acceptable range for home usage.

While a high CRI might be preferable in certain domestic settings, like kitchens, closets, or the home offices of people in the creative fields, lumen level and CCT are usually all you need to be concerned about.

On our website, CRI can be found on the product pages of light bulbs that offer that information under Product Description?

Contact us if you need help selecting an LED based on CRI.

RECOMMENDATIONS
Room Brightness (Lumens) CCT (°Kelvin) Colour
Kitchen Ambient: 5,000-10,000

Task: 450 minimum per area

4,000-6,500 Daylight
Bathroom Ambient: 4,000-8,000

Task: 1,700 minimum

4,000-6,500 Cool white-Daylight
Home Office Ambient: 3,000-6,000

Task: 1,200 minimum

4,000-5,500 Cool white
Dining Room Ambient & Task: 3,000-6,000 4,000-5,500 Cool white
Entryways, Stairways, & Halls Entries & Stairways
Ambient: 1,200-4,000Hallway
Ambient:1,200-2,500
3,000-4,000 Warm-Cool white
Bedrooms Ambient: 2,000-4,000

Task: 500 per reading light; 4000 for closet lighting

2,700-3,500 Warm White
Outdoors Front Door
1,000-2,000Side & Back Pathways
300
3,000 or less Very Warm White
Living Room Ambient: 1,500-3,000

Task: 400 minimum

1,500-3,000 Very Warm White

 TM-30 AND BEYOND

While the CRI is a useful tool, it is not without its flaws and limitations. To address these issues, the CIE has been looking into a replacement for years. In 2015, the Illuminating Engineering Society (IES) introduced a new method of measuring and evaluating colour quality calLED the IES TM-30-15, though you will often see it referred to by the shortened name: TM-30. This method improves upon the CRI, adding new tools to enhance accuracy and providing more detaiLED information in order to provide a more comprehensive measurement of how light affects colour appearance, such as:

  • Fidelity Index (Rf)– like the CRI, the Rf measures the average fidelity of colour samples on a scale of 0 – 100. However, instead of 8-14 samples, this measurement uses 99 samples broken down into 7 categories: colour systems, nature, paints, plastics, printed material, skin colour, and textiles.
  • Gamut Index (Rg)– Rg measures average colour saturation. A score higher than 100 indicates an increase in chroma (saturation or intensity), meaning that objects lit by that bulb will appear more saturated than they would in natural daylight, whereas a lower score indicates a lower level of saturation. To get good quality colour, an acceptable Rg level for LEDs is between 80-120.
  • Colour Vector Graphic– A visual representation of Rg that clearly shows the differences in hue and saturation when compared with natural light. This circular graphic displays which colors are muted or more vivid under a light source.

While the TM-30 scale is an approved method that builds on the CRI and offers a greater level of accuracy, it has not fully replaced the CRI just yet. In late 2015, the CIE released a statement saying that the TM-30 scale would be the basis for an update of the CRI, rather than a replacement. As it stands, the TM-30 is currently only intended for use by manufacturers and lighting specifiers. A simplified version will be available for consumer applications in the future, but the CRI will not be replaced until a new metric has been widely approved and accepted.

CRI VS. TM-30
CIE CRI IES TM-30-15
Introduced 1964 2015
Measures> Colour fidelity Colour fidelity
Colour gamut
Graphic, detaiLED hues
# of Colour Samples 8

· Medium chroma/lightness

· Spectral sensitivity varies

· Munsell samples only

99

· Uniform colour space coverage

· Spectral sensitivity neutral

· Variety of real life objects

Reference Illumination Step function Continuous
Scale No lower limit for scores, inconsistent scales 0-100 for Fidelity (Rf)

For a more in-depth look at TM-30 and the differences between it and CRI, check out this video from the U.S. Department of Energy.

LED BULBS PLACEMENT

Different locations and types of fixtures also require different considerations. Every room has a unique mixture of basic lighting types, which will be dependent on your personal needs:

  • Accent– directional lighting used to highlight architectural features, artwork, photography, and mementos within a room.
  • Ambient– provides you with a general level of light necessary to move around safely within a room. It sets the tone of the room and creates an atmosphere.
  • Task– lighting designed for a specific task. Used at desks or other work areas so you can see what you are doing without glare or reflection and not strain your eyes.

LED light bulbs operate well in most environments, handling cold and moisture better than other bulbs, but always make sure you check the IP rating of a bulb before selecting it for outdoor applications or areas where it may be subject to moisture, water, dust and debris.

PRO TIP: If the LED bulb is going to be enclosed within the fixture, like with certain types flush mount ceiling lamps or outdoor street posts, make sure that it’s rated for use in enclosed spaces. Otherwise, it can overheat and burn out prematurely.

Above all is the key tips to buy led bulbs, if you want to learn more about our good and cheap led light bulbs, please visit NVT Lighting’s official website www.360bulb.com.