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About Us

Shenzhen Lightiger Industries is a cooperation focuse on LED Light with Factory established in 1998,and dedicate in LED Lighting manufacturing since 2004,such as LED street Light,LED Plant light,LED Panel Light,LED Strip Lights etc.

we devote ourselves in devoloping and searching Human health LED Light,smart LED Light,environmental friendly LED light,such as sensor LED Light,solar LED light,eyes protection light and so on.

  Lightiger have two our own running professional factories based in Shenzhen and Zhongshan,to combine high Technich of Shenzhen and Low cost in Zhongshan.These two factories are both specializing in Lighting manufacture Industries more than 12 years since 2004 and 2006.With the devolopment of LED light,in order to extend the business of Oversea market,and serve customers better,Lightiger Industries established with the hopes and trust of factories' and customers',We are trying to be better and better.



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A simple definition of Color Rendering Index (CRI) would measure the ability of a light source to accurately render all frequencies of its color spectrum when compared to a perfect reference light of a similar type (color temperature). It is rated on a scale from 1-100. The lower the CRI rating, the less accurately colors will be reproduced.


still can not understand?

A.a flower under LED Light

B a flower under the natural Light.

if the more flower looks like B,the higher CRI A led light has.

The development of light-emitting diodes (LEDs) in the last few decades has introduced growers to a new source of lighting that provides many superior advantages.

First of all, plants need wavelengths in the visible region (400-700 nm) in varying proportions. Photosynthetic photon flux (PPF) designates the intensity of visible spectral radiation, which plants use in the photosynthesis process.

Plants use more red and blue light for photosynthesis than they do green, and the absorption spectrum of plants can effectively be matched by using the right combination of LEDs.


LEDs as an illumination source in an indoor garden are much more suitable than other grow lights whose peak emissions widely differ from the absorption spectrum of plants.

LEDs allow growers to pick the spectrums of light they want, rather than relying on whatever colors the phosphors happen to make, or what color sodium glows at when it gets really warm.

Some wavelengths of interest for growers using LEDs, within the 400-700 nm range, applicable to plants growth, are:

  • 439 nm is the blue absorption peak of chlorophyll a.

  • 450-460 nm is the royal blue that is absorbed by one of the peaks in beta-carotene. It is a readily available LED wavelength commonly used to excite the remote-phosphor in white LED lamps.

  • 469 nm is the blue absorption peak of chlorophyll b.

  • 430-470 nm is a range that is important for the absorption of chlorophyll a and b, which is key for vegetative growth.

  • 480-485 nm is the second absorption peak of beta-carotene.

  • 525 nm (green light) is a phototropic activator that researchers are still trying to find the chromophore of. Green light isn’t important for photosynthesis, but it is apparent that plants are gaining direction and environmental signals from it, and that it affects internodal spacing. This is also the wavelength of GaN or InGaN green LEDs commonly used in RGB and tunable applications.

  • 590 nm is key for carotenoid absorption. Carotenoids are starch-storing, structural and nutritional compounds.

  • 590 nm is additionally the phycoerythrin absorption wavelength. Phycoerythrin is a red protein-pigment complex from the light-harvesting phycobiliprotein family, present in red algae and cryptophytes, and is an accessory pigment to the main chlorophyll pigments responsible for photosynthesis.

  • 625 nm is the phycocyanin absorption peak. Phycocyanin is a pigment-protein complex from the light-harvesting phycobiliprotein family, along with allophycocyanin and phycoerythrin. It is also an accessory pigment to chlorophyll.

  • 642-645 nm is the peak absorption point of chlorophyll b.

  • 660 nm is often called the super-red LED wavelength and is important for flowering.

  • 666-667 nm is the peak red absorption point for chlorophyll a.

  • 730 nm, often referred to as far-red, is important for phytochrome recycling. It is needed for all kinds of morphogenic (shape-forming) processes. A few minutes of 730 nm light treatment after the full light cycle is over will revert the phytochrome chromophore from activated to inactive. This resets the chemistry for another lights-on cycle and may be useful in shortening the classic dark side of the photoperiod. This color is important to plants but is not considered in PPF as it is outside of the 400-700nm PPF range.


LEDs provide growers the unique opportunity to use a light spectrum that can be tailored to provide maximum benefit to the plants and minimize wasted energy. Several LEDs at different wavelengths can be combined to provide an ideal illumination source that follows the plant-sensitivity curve. Aside from this, there are several other advantages of using LEDs in horticulture, including:

  • Geometry: Since radiation falling on a plant is inversely proportional to the square distance between the source of radiation and the plant, it is advantageous to bring plants closer to the light source. LED lights can be placed closer to plants than is possible with other lamps because LEDs run cooler than other lights that produce a lot of heat and will burn leaves at close distances.

  • Efficiency: The electrical efficiency of LEDs is much higher than other grow lights, which helps growers save on their electrical bills.

  • Durability: The lifetime of an LED is defined as how long it takes for it to drop to 70% of its original value. This is about 50,000 hours—much longer than the typical lifespan of fluorescent or HPS lights.

  • Spectral quality: Spectral quality of a carefully chosen LED illumination source can have dramatic effects on plant anatomy, morphology and pathogen development.

  • Small size: The small, compact size of today’s LED fixtures allows more options for installing the light source, and more space for plants to grow.

Several researchers have experimented with using different intensities and wavelengths to grow different crops. It is important to understand that different crops may behave differently under different illumination levels, and different light recipes may be needed for each crop, but overall, an increased PPFD causes an increase in plant growth.

Although red light is sufficient for plant growth, blue light is important for increased leaf thickness and number of chloroplasts. For example, rice plants grown under a combination of blue and red LEDs showed higher photosynthetic rates than those grown under red illumination alone.

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 It’s also worth noting that although a combination of red and blue LEDs is useful for better crop growth, the presence of both these colors in a growroom makes it difficult to  observe plants visually and check for disease symptoms.

The addition of a few single green light bulbs, although not as essential for plant growth as blue or red as mentioned earlier, makes it easier to visually assess the plants for damages.

Along with the benefits of growing with LEDs, another important issue for researchers is the development of metrics for quantifying PPFD and light absorption by crops.

Growers need to calibrate their LED light sources and find the optimal light recipe as far as flux efficacy, appropriate wavelengths for different crops and optimal geometry of illumination is concerned.

There are affordable spectrometers and PAR meters that can be used to measure light output and intensity.

Smartphone apps that are used in conjunction with a phone’s camera are also being developed that will help give growers a rough idea of how intense their lights are. The PPFD measurement is simply done by pointing the device at the light source and pressing a button.

Some spectrometers are also being designed to work in conjunction with smartphones to provide even more accurate readings. The software behind these apps also records data on a day-to-day basis, and monitors the growth of the plants.

The resulting plant journals, or logs, will help growers closely monitor what’s going on in their growroom, and what the best course of action should be if things go sideways or otherwise require attention.



Laura Gaskill, Houzz Contributor

Using solar lighting outdoors can be a lifesaver when outdoor outlets are not available. But do solar-powered lights really work? How do they measure up to hardwired electric lights? And what if your yard is shady or you live somewhere that rarely sees the sun? Here’s the full scoop on choosing and using solar-powered lights in your yard.

How solar lighting works. Photovoltaic cells absorb sunlight during the day to charge the batteries, which then light the bulb at night. Because solar lights are powered by the sun, they must be placed in an area that receives full sun — ideally eight or more hours per day.

What if you don’t have direct sun? If you are putting solar lights in your desert yard in Tucscon or Palm Springs, they are sure to operate at maximum strength — but what if you live in Seattle or simply have a heavily shaded yard? It’s not quite as simple, but you can still have solar-powered lights, even in a fully shaded area. A solar or landscape lighting pro can help position a remote photovoltaic panel on your roof or in a sunnier area of your yard, which can then be wired to the lights in the shady area.

 

If there simply isn’t much sunlight to be gathered, even on the roof (for example, you live somewhere like Seattle or Portland), the solar lights will still work, but they won’t shine as brightly or for as long each evening.

Types of Solar Lights

Solar path lights. These are small solar lights on stakes, which can be pushed into the ground alongside a walkway to softly illuminate the path at night. They are not as bright as electric path lights, so plan to use more (up to twice as many) to light your path with roughly the same glow as electric.

Get help: Work with a local landscape architect

 

Where to use solar path lights. Solar path lights are ideal for illuminating walkways far from exterior outlets, and can provide an enchanting glow along winding garden paths.

Ambient and decorative solar lights. Decorative solar lights, including colorful blown glass, decorative lanterns and string lights, are not as bright as solar path lights. However, used in multiples or alongside path lights and spotlights, they can provide a warm ambient glow.

Where to use ambient solar lights. Place a few handblown glass solar lights on stakes in your garden beds for soft landscape lighting. Or hang solar string lights, like the charming mason jar lights shown here, over an outdoor dining table for a welcoming touch at your next gathering.

Solar-powered spotlights. The brightest solar lights available are called task lights or spotlights, and the best ones can provide light that’s roughly equivalent to a 40-watt incandescent bulb. That is still not as bright as a typical outdoor spotlight, so you may want to double or triple up in areas where you want bright, direct light.

Where to use solar spotlights. Motion-sensing solar spotlights can be used near doors and in the driveway. Spotlights can also be placed in the garden, with the beam of light directed at a tree or another landscape feature.

Pay attention to the hue. Since most solar-powered lights today use LED bulbs, the light they emit is bright white. If you want the look of incandescent bulbs, look for solar lights with tinted covers — they may be labeled “amber” or “soft white.”

You get what you pay for. The brightness of a solar light depends on the brightness of the sun and the amount of daylight it is exposed to — but it also depends on the quality of the photovoltaic cells and the size of the LED bulb. Higher-quality photovoltaic cells and larger LED bulbs tend to cost more, so to a certain extent, the higher-priced solar lights do tend to shine more brightly.

The potential effects of LED street lighting on health and the environment have been a hot topic of discussion over the last year. As this conversation has evolved, so too have many misperceptions and mischaracterizations of the facts on LEDs. We’ve assembled an array of helpful resources on the topic to help shed some light  and are clarify some of the most common myths on LED streetlights.


Myth: LED streetlights are more harmful to humans and animals than other kinds of streetlights.

LED streetlights are no more harmful to humans and animals than other kinds of streetlights. The concern is not the type of light source, but the amount of emitted light that falls in the short-wavelength, often referred to as the “blue” part of the spectrum. And, unlike other types of streetlights, LED streetlights actually offer the potential to control the amount of short-wavelength light that they emit.

Myth: All short-wavelength light is harmful to humans and animals.

On the contrary, short-wavelength light is a fundamental component of the natural world. It’s present in sunlight and has been shown to play an important role in a number of physiological processes, such as affecting circadian rhythm (our 24-hour “biological clock” that controls sleep/wake cycles). The concern is that too much nighttime exposure to short-wavelength light may disrupt sleep patterns and have other undesirable effects.

Myth: LED lighting emits more short-wavelength light than do other lighting technologies.

It’s true that early LED lighting products tended to have greater levels of short-wavelength content because the technology was still in its initial stages of development. Tremendous advances since then, however, mean that today’s LEDs can be designed to emit as little, or as much, short-wavelength light as desired, without excessive drop-off in efficiency or other aspects of performance. LEDs also offer much greater control over where the light falls. This means they can often meet the same illumination requirements as conventional streetlights while emitting much less light – thus reducing even further any short-wavelength content.

Myth: Street lighting should never emit any short-wavelength light.

Most street lighting situations benefit from having at least some amount of short-wavelength content. Short wavelengths are a key component of the visible light spectrum, with benefits ranging from aesthetics to safety. White light sources that contain short wavelengths, for example, can show the colors of objects more naturally, aid in identification of people and objects, improve the contrast between an object and its background, and enhance peripheral vision at the low levels of illuminance that typically characterize street lighting.

Myth: Communities are better off with conventional street lighting.

For the last several decades, most street lighting in the United States has used high-pressure sodium (HPS) technology, which emits orange-yellowish light. HPS street lighting is being replaced by street lighting technologies that emit “white” light – primarily LED, due to its higher efficiency and longer life. All white-light technologies – including LED – emit more short-wavelength light than HPS. In addition to lasting longer and being more efficient – which by the way provide substantial energy and cost savings – LED street lighting also offers other potential benefits. For example, unlike other types of street lighting, LED systems can be adjusted to provide only the level of illumination needed at any given time, and can also offer a high degree of control over the direction in which light is emitted. This makes it much easier to reduce glare, light trespass (the spillover of light into areas where it’s not wanted), and uplight (which contributes to the phenomenon of “sky glow” that reduces visibility of stars in the night sky).

LED street lighting can play a critical role in avoiding unintended consequences to humans and wildlife – as long as care is taken to make sure the light is directed only where it is needed, with minimal glare, and that it emits a spectrum that supports visibility, safety, and health.


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