Difference between isolated driver and non-isolated driver (power supply)

The isolated power supply use a transformer to transform AC220V voltage down to a lower voltage, then rectified into DC output. Because the primary coil of the transformer will withstand AC220V voltage, the secondary coil is exposed only to low AC voltage output, and there’s no direct connection between primary and secondary coils, so it is called as “isolated power supply”. For non-isolated power supply, AC220V is connected directly to the electronic circuits, electronic components step-down the voltage to lower output, so input and output is connected directly through the electronic components, so we call it as “non-isolated power supply”.

The advantages of the isolated power supply is: do not pose a threat to the human body, wide voltage performance is very good. The isolated power supply can get constant current precision within ± 5% which is hard to achieve
by non-isolated power supply. However, comparatively, the non-isolated power supply has higher efficiency and the cost is lower. Generally, as far as safety use is concerned, we recommend to apply isolated power supply; but if
the end user has no safety concern and the main concern is economical solutions, we recommend to use non-isolated power supply.

How to evaluate LED lighting products?

To fully evaluate an LED lighting product one needs to review the overall system efficiency, optical control, thermal management of the LEDs, and know at what point in time the fixture will reach 30 percent lumen depreciation. LED lights with good optical efficiency and thermal management will be able to deliver more lumen output, on average, than traditional HID products. As the Department of Energy concluded in its Solid-State Lighting Commercial Product Testing Program: “Until the field of SSL technologies and supporting knowledge matures, any claims regarding performance of SSL luminaires should be based on overall luminaire efficacy (i.e., from testing of the entire luminaire, including LEDs, drivers, heat sinks, optical lenses and housing), to avoid misleading buyers and causing long-term damage to the SSL market.”

Single end power LED tube and Double end power LED tubes

If it is single ended powered LED tubes, need to power only one end. This type of installation is referred to as unshunted. If double ended powered LED tubes, need to power both ends, one with line source, the other end with neutral. This type of installation is referred to as shunted.

Led tubes are a better choice than those traditional light sources because they are more economical, energy efficient, conserve power, lower our electricity bills and moreover get those hazardous fluorescent or other potentially dangerous incandescent lights out of our lives for good. Getting led lights installed is the best way to save money and go green to protect the earth and your own lives as well.

Normally there are two ways of using LED tubes to replace old fluorescent tubes.

First, check your old fluorescent tube is double ended power or just single ended power. If your old fluorescent tube is double ended power, here is the installation guidance for double ended power LED tubes.

Step1: Cut off the power for traditional tubes (Note: As just turn off switch for not sure power totally off from the lighting fixture, we suggest removing the fuse or cut off the circuit interrupter)
Step2: Remove the traditional tube from the holder.
Step3:For replacing original tube, open the cover of the tube holder, seeing the wire connected situation in holder, remove the starter and ballast.
Step4: Put the cover back to the holder, and then install LED tube into the holder, connect two wires to LED tube.

If your old fluorescent tube is single ended power, here is theinstallation instruction:

1.The steps of inductive fluorescent T8 tube with holder£º

Step one: Shut off the power supply, removal of fluorescent lamp.
Step two: Remove the starter.
Step three: Install short circuit device, instead of the starter.
Step four: Installation of the LED lamp replacement.

2. The steps of Electronic fluorescent T8 tube with holder£º

Step one: Shut off the power supply, removal of fluorescent lamp.
Step two : Removal of electronic ballasts, connecting wire into a single ended power supply.
Step three : Installation of the LED lamp replacement.

In fact, it is very easy to install a LED tube. By using LED lights, it will save your money and save energy. Now, most governments are advocating to use LED lights, and most European countries are advocating to use single ended power LED Tubes, as it is safer than double ended.

What is LED and its advantage

Light emitting diodes (LEDs) are solid-state lighting components. Each individual LED consists of a semiconductor diode that emits light when a voltage is applied to it.

LEDs can be many times more energy-efficient than light bulbs, depending on the application. LED lighting can save up to 85 percent of the electricity used by incandescent bulbs and up to 50 percent of electricity used by fluorescents. The electronics industry has used LED technology for several decades as indicator lights for various electronic devices. In more recent years, LED technology has progressed to the point where it is viable for general lighting applications.

LED is a kind of cool light source. Most of the energy emitted from incandescent bulbs is converted to heat instead of light. That¡¯s why you¡¯ll burn yourself if you try to touch an incandescent bulb once it¡¯s turned on. Since LEDs consume significant less energy, they don¡¯t emit much heat. That¡¯s why you typically won¡¯t burn yourself if you try to touch an LED light once it¡¯s turned on.

LEDs have no moving, fragile parts and can last for decades. LED lights are designed to last about 50 times longer than incandescent lamps, which means less maintenance and less waste.

LED is the most advanced and mature lighting technology in the market today. It promises long life, quality of light and substantial energy savings. Many factors determine these characteristics including the quality of the LED chip and assembled package, driver regulating power flow, thermal management, optic lens as well as the intended application.
Not all LED lighting is alike. There are significant differences in pricing and performance. Lifetime and lumen output can vary greatly so it is critical to purchase LEDs from a professional and reliable supplier who stands behind their products.

LEDs are free from toxic elements making them safer for humans and the environment. Additionally, LED uses significantly less energy to produce the same amount of light compared to traditional lighting technology. This results in reduction of mercury emissions.

What's the difference between CRI and CCT

Usually, there are two key measures used to valuate lighting sources:

Color Rendering Index (CRI)
Correlated Color Temperature (CCT)

CCT measures the color of a light source by using Kelvin (K) temperature, which indicates the warmth or coolness of a lamp¡¯s color appearance. The lower the Kelvin temperature (2700¨C3000 K), the warmer the color of the light, while the higher the temperature (3600¨C5500 K), the cooler. But CCT does not indicate how natural the colors of objects appear when illuminated by a light source. In fact, two lamps can have the same CCT but render colors much differently. This is why we need other measure like CRI to reflect such difference.

Color Rendering Index (CRI) helps match human perception of color quality.

According to Wikipedia, the color rendering index (CRI) of a light source is a quantitative measure of its ability to reproduce the colors of various objects faithfully in comparison with an ideal or natural light source. To put it in simple words, CRI is a measure of a light source’s ability to show object colors “realistically” or “naturally” compared to a familiar reference source, like incandescent light or daylight. The higher the CRI, the better the light source renders every color in the visible spectrum. To have what is generally considered good color rendering, a light source, for example the LED, must have CRI over Ra72 and ideally reach Ra90.

Both CRI and CCT are important when we are considering if the led lights are qualified or not to replace traditional incandescent or halogen lamps.

Why is LED a Green and Eco-friendly technology?

LEDs are environmentally friendly in many aspects. Firstly, unlike HID (High Intensity Discharge) lamps LEDs contain NO mercury. In addition, some LED luminaires are RoHS (Restriction of Hazardous Substances) compliant and have been designed to provide more than a decade of near maintenance-free service. This means no re-lamping which means no waste.
Assuming an HID fixture is re-lamped every two years, that¡¯s five re-lamping cycles over a 10 year period. Just imagine the benefits of choosing LED.
No concern over proper disposal of old HID lamps containing harmful mercury.
No fuel used and therefore no pollution to service those fixtures.
Greatly reduced potential for lane closures and other productivity and inconvenience-related costs associated with maintaining an HID system.
No natural resources lost to produce the replacement lamps that contain mercury.
No fuel used to move old-technology lamps from the factory, to the distributor, to the contractor, to the job site.
It¡¯s important to keep in mind all the positive and powerful effects that using LED technology can have on the environment.

Why is the life span of an LED measured as lumen depreciation

The life span of an LED is vastly longer than that of incandescent, fluorescent or HID lamp sources, generally lasting 50,000 hours or longer. Although the LED never really burns out, product life span is measured by lumen depreciation. The Illuminating Engineering Society’s (IES) current standard for calculating the life of an LED as the point at which the LED reaches 30 percent lumen depreciation. Remember, a 100,000-hour rating is not equivalent to lamp life rating. LED life is rated where it has reached 30 percent lumen depreciation. At 100,000 hours an LED would still be operating, but at a decreased lumen output. Haichang LED lights uses quality and branded LED lamps to make sure very low lumen depreciation within 30,000 hours.
Why is the life span of an LED measured as lumen depreciation

The life span of an LED is vastly longer than that of incandescent, fluorescent or HID lamp sources, generally lasting 50,000 hours or longer. Although the LED never really burns out, product life span is measured by lumen depreciation. The Illuminating Engineering Society’s (IES) current standard for calculating the life of an LED as the point at which the LED reaches 30 percent lumen depreciation. Remember, a 100,000-hour rating is not equivalent to lamp life rating. LED life is rated where it has reached 30 percent lumen depreciation. At 100,000 hours an LED would still be operating, but at a decreased lumen output. Haichang LED lights uses quality and branded LED lamps to make sure very low lumen depreciation within 30,000 hours.