LED Light Bulb Purchasing Considerations

Because of their many advantages over traditional incandescent and fluorescent bulbs, LED lighting is ready to transform all forms of lighting. To choose and purchase LED lighting, buyers need to learn new terminology and consider factors they should not think about when purchasing traditional lighting types. This brief article provides basic information and purchasing considerations for first-time buyers of LED replacement lamps.

As most people probably know now, the term LED means light-emitting diode. When electricity passes through them, they emit energy in the form of light. LEDs convert most of the energy that passes through them into the light, unlike incandescent bulbs that produce light as a by-product of heating.

For this reason, LEDs can be up to 90% more efficient than traditional incandescent bulbs.LEDs have been widely used as displays and lights for nearly 40 years. It is only recently, however, that engineers have discovered how to mass manufacture and mass produce bright white LEDs that can be used for general lighting.

The high brightness and point-source characteristics of LEDs have made it the first choice for traffic lights and car taillights, where visibility and reliability are essential.So what do you need to know when buying LED bulbs? The following list provides some basic guidelines:1. Although the initial cost per bulb remains high, the total lifetime cost of an LED Light is actually lower than that of equivalent incandescent and CFL bulbs.

Taking into account the energy costs and the time and resources required to replace incandescent bulbs and compact fluorescent lamps, an 80,000-hour LED bulb has a much lower cost for life.2. LEDs are diverse and, as unlucky buyers have every chance of finding the solution, many types are useless for general lighting applications. The finest LED chips emit light with a color rendering index (IRC) of 85%.

The CRI, by the way, is a quantitative measure of a light source's ability to accurately reproduce the colors of various objects in relation to an ideal or natural light source. LED bulbs that use high-quality LEDs will last much longer than fancy bulbs that many sells and 60% longer than many competing bulbs that use lower quality LEDs.3. Contrary to what can be read in some places, LEDs generate heat, and this heat is actually the main problem of manufacturers for the development of LED lighting applications.

Manufacturers can now produce individual LED chips as bright as a 100-watt incandescent bulb, but these LED Lights are virtually useless for general lighting because their installation in a device creates problems of ventilation that has not yet been resolved. LEDs installed in light fixtures and bulbs must be properly ventilated. The more efficient the chip, the harder it is to cool it properly.

There are many LED bulbs on the market that ignore this and use cheap chips to not ventilate them or properly ventilate their chips, greatly reducing their lifespan. While the typical LED bulb is barely hot to the touch, if the chip is not properly ventilated, it can break down prematurely.4. Although LED bulbs last much longer than conventional bulbs, take a close look at the manufacturer's statements about the life of the bulb.

The lifespan of an LED bulb should be its 'half-life'. LED bulbs do not go out; on the contrary, they are gradually disappearing. When a supplier declares that an LED bulb will last 80,000 hours, this means that by this stage the chips will have reached a 50% efficiency and that the bulb needs to be replaced.

As a result, the bulb could last 100,000 hours or more, but its effectiveness would have deteriorated significantly at this stage. Using this 100,000-hour lifespan as a selling point is therefore misleading. Although LEDs do not last forever, they will last 50 to 75 times longer than a comparable incandescent and 6 to 8 times longer than a CFL.


When you search the web, you will quickly find that the LED bulb market is flooded with products. Many of these bulbs are relatively inexpensive (less than $20); However, you may find that many of these LED bulbs are made of dubious materials and questionable manufacturing. Good LED bulbs cost more than these cheap bulbs because they use high-quality chips at prices set firmly by reputable manufacturers like Cree.

This means that even though these LED bulbs are more expensive, they are far superior.6. LED bulbs cannot be attenuated with traditional dimmers. LEDs require a constant current to operate.

For this reason, if a standard gradation method is applied, it will flash at regular intervals, or worse, simply won't work. To dim leD light, a 0-10V gradation module is needed to "mislead" the LED to emit less light. In theory, all LED Lights are adjustable with this module.


When comparing LED bulbs, you need to understand lumens. Light is a standard unit that you can use to compare LED bulbs to standard bulbs, such as incandescent bulbs and halogens. Basically, light is a measure of brightness.

The amount of light is important, but the quality of light, i.e. light efficiency (light/watt), is perhaps even more important. Current quality LEDs have a light efficiency of between 60 and 70 lumens/watt.


Color temperature and beam sprawl are the other essential tools for comparing LED lights. The color temperature and the spread of the beam are measured in degrees. The color temperature refers to the color of the light emitted.

In general, 3,000 Kelvin is warm white (closer to infrared light) and 5,000 Kelvin is cold white (closer to ultraviolet light). Cold white is brighter because it is the natural color of LED Light, while fleas that emit a warm white light require a phosphorous "filter" to "heat" the color temperature, thus reducing the brightness of the chip. The scattering of the beam is the angle of the light emitted.

The lower the number, the more the light is like a 'spot'


Is the light from CFL and LED bulbs coherent?

Diffraction grating spectrometers work on all light sources-not only the CFL and LED bulbs that you mention, but also incandescent lamps, the sun, chemical reactions (e.g. fireworks), etc. There is no distinction here between what you think of as "incoherent" light sources-that is, light sources with no long-term correlations in their signals-and "coherent" light sources, such as many lasers. The "coherence" that makes a diffraction grating work is a different kind of coherence.

What's "coherent" is that all of the slits (for a transmission grating) or grooved surfaces (for a reflection grating) are lit by the same light sourcetogether,in sync All of those slits or grooves reradiate the light in the same way. Becausetheyare all correlated, you can get interference at some distance from the grating. And since the angular dependence of the inference pattern depends on the wavelength of the light, you can see spectra.

Broadening out the answer, "coherence" isn't a yes/no thing. It's a property with a continuous range of values. And there's "temporal" coherence-for a light source, how output at different times are correlated-and "spatial" coherence-how correlated different spatial points of light are to one another.

A deep dive requires statistical optics.

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