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NEWS! An advanced, user friendly, Grow light Source.com website is up and running for your use and enjoyment. All this Information, and more, is served up in smaller, easier to find modules, relevant videos and slides shows are available at each product page. You are invited to write product reviews, and to use the social links to share stuff with your communities. Visit our partner, GrowLightSource.com, to acquire light products, Led4Growth.com is an information only Website.Grow Light Source

The PLS by LG is no longer sold in the US, with no UL approval LG will not market them. Magnetic Induction Lighting is recommended as the superior cost effective and productivity choice over Microwave Induction Lighting.

The Lowdown on LED Grow Lighting
Much of this also applies to Plasma Grow Lights.
LED Grow light are excellent for Greenhouse supplementation.

The Lowdown



Nasa Studies

University of Minnesota Study

Observed Benefits


A Manufacturer Claim

Chlorophylls and Carotenoids

Seasonal Color Theory

Blue Boosting

The Bottom Line

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Don't forget to read - The Bottom Line!


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Talk Back @ Led4growth's Blog Post

The Lowdown on LED Grow Lighting:
Some have expressed doubts about the effectiveness of LED Grow Lighting, we agree, the earlier generations of LED Grow Lights have been disappointing, we hope to have a discussion that will shed some light on the subject. This is what I have gleaned thus far, you are welcomed to share your experience.

We suggest that at this time LED lighting is best used as supplemental Greenhouse lighting and as supplemental lighting for indoor use to add spectrum for better results with particular species.

A few have reported that LED Grow lighting alone does not produce as prolific vegetative growth as they get with Sunlight or HID grow light sources, but, reference to controlled studies by NASA indicate that is not true, that in fact 80/20% Red/Blue LED Grow Lighting outperformed HID Lights, and neither source did quite as well as natural light, see the chart below.  There are many variable beyond light alone, but the quality of light is key.

In real world use the LED does a pretty adequate job with Veg states, but does not provide optimal results with Flower. You will need a good deal more light than most manufacturers suggest.

One of the biggest problems with LED Grow Lighting is the failure rate, they often have power supply issues or burn out LEDs. This is has been a huge challenge, to find a reliable manufacturer that also build a product that deliver appropriate spectrum.  We have narrowed our choice down to only a couple.

Missing Spectrum, Unraveling the code:
It appears that some manufacturers have selected nm ranges that when combined provide a very nice and full spectrum, yet one has to ask, can the spectrum be truly full without green and/or white light?  The addition of  White LEDs (our manufacture added 3500K white modules) makes for a very full spectrum, with small amounts of numerous green and white gradations, the resulting waveform closely matches that of the absorptive spectrum of green plants, but not as wide as Inda-Gro Lights or PLS.

Current "Future" Applications of Horticultural LED Lighting, Specialized Supplemental Lighting:  The experts tell me these lights, Flower Initiator, will not be supplemental, but an essential light.

Now Available: "The Flower Initiator" Far RED LED Flood lights.  Users have reported accelerated bud initiation. You might "experiment" with this light on a separate timer for 1 Hour prior to lights out then for 10-15 minutes thereafter, as a phytochrome trigger, to hasten the instigation on Budding, reducing the Phytochrome switch period from 2 hours to 10-15 minutes. Other optional experiments are suggested on the order page.

Not all LED Grow Lights are created equal, quality might vary and our "state of the art" commercial products yield greater intensity than LED Grow Lights did in the past, yet we still suggest they are best for supplemental usage for spectrum tweaking. Our lights pass the reliability test with flying colors.

Heat and Cold:
It has been suggested that, in some cases, a growing environment may have been too hot or too cold to make the plants respond with Spring like growth.  In colder climates the lack of heat theory makes sense, it is well known that waste heat is one thing produced in excess with HID lights and that LED Lighting produces less heat.  Perhaps a supplement of FAR RED or Spectrum or retaining some HID Light for heat and additional light might do the trick.  Although a well insulated air tight, temperature and humidity controlled space should receive enough heat from LED Grow lights, they do produce waste heat.

With all methods excessive heat also can greatly reduce productivity.

It is generally known that too much heat is generated by HID lamps, Fans and Movers are employed.   Movers are not required with Led Grow Lights, fans are needed only when the environment itself generates excessive heat, but the plants like moving air, the Led Grow Lights produce what is generally just sufficient heat and is easily dissipated by built in cooling fans.

The truly important aspect of artificial lighting is the concept of Action Spectrum, or the amounts and colors of light that are absorbed and used by chlorophyll producing plants.

From Wikipedia, the free encyclopedia:
An action spectrum is the rate of a physiological activity plotted against wavelength of light. It shows which wavelength of light is most effectively used in a specific chemical reaction. Some reactants are able to use specific wavelengths of light more effectively to complete their reactions. For example, chlorophyll is much more efficient at using the red and blue spectrums of light to carry out photosynthesis. Therefore, the action spectrum graph would show spikes above the wavelengths representing the colors red and blue.

The following action spectrum graph for chlorophyll production is overlaid upon the color wavelength spectrum, the corresponding spectrums generated by standard 80% Red/ 20% Blue LED Grow Lights and standard HID (Metal Halide) Grow Lights are also overlaid.

One can observe that the standard HID Light produces light spectrums that are insufficient in the blue and red spectrum and excessive in the yellow-orange spectrum as well as in the yellow and green spectrum, where very little is absorbed.  Halide lights compensate for this by producing bulk amounts in all spectrums they produce.

LED Grow Lights, used for this example, more closely parallel the exact wavelength requirements for chlorophyll producing plants, although most produce an excess of Red and are somewhat deficient in Blue light.  By generating a light spectrum that most closely matches the Action Spectrum yields the greatest results with the least amount of energy expended.

Our quality manufacture provides for a superior product, made with a better spectrum matching and better balanced ratio options of BLUE, RED, Orange, Deep RED and White light.  You will be convinced by the improved health and productivity in all phases used as supplemental lighting.

The Standard Spectrum light include 10% 3500K White to fill in the requirements in the trough in the yellow and green zones.

Understanding General Spectrum Information:

200 - 280 nm UVC ultraviolet range which is generally harmful to plants. LEDs in this spectrum are non-existent or very expensive.

280 - 315 nm Includes harmful UVB ultraviolet light which causes plants colors to fade. This range is useful for Trichrome production, believed to be due to positive stress.

315 - 380 nm UVA ultraviolet light which is neither harmful nor beneficial to most plants.

380 - 400 nm Start of visible light spectrum. Process of chlorophyll absorption begins. UV protected plastics ideally block out any light below this range.

400 - 520 nm The violet, blue, and green bands. Peak absorption by chlorophyll occurs, and a strong influence on photosynthesis. (promotes vegetative growth)

520 - 610 nm The green, yellow, and orange bands and has less absorption by pigments.

610 - 720 nm The red band. Large amount of absorption by chlorophyll occurs, and most significant influence on photosynthesis. (promotes flowering and budding)

In Sunlight the ratio of red (660nm) to far red (730nm) is about 1.2:1
Interestingly Phytochrome Pfr is activated by 660nm and Pr is activated by 730nm.

720 - 1000 nm Little absorption by Chlorophyll here, Phytochrome responds in the 720range. Flowering and germination is influenced. Near this range and higher end of the band is the Infrared spectrum, which is mostly heat and promotes elongation or negatively affect water absorption/transpiration.

Many plant pigments have dual wavelength peaks that can be activated with LED light combinations:

Beta-carotene 450nm 480-485nm dual peak

chlorophyll a 430nm 662nm dual peak

chlorophyll b 453nm 642nm dual peak

phycoerythrin 590nm single peak

phycocyanin 625nm single peak

670nm and 700nm for the Emerson effect.

The LED - Light Emitting Diode:
The LED is similar to a transistor in that it is a solid state device, which work so efficiently as to produce very little in the way of waste heat.

LED lights will operate up to 60,000 hours before dropping below 75% of initial production, HID lamps loose 20% of productivity after the initial burn-in period.   While well dispersed the LED light is directional, unlike 360 conventional lighting, which adds 46% more useable Lumens.

30%~40% Energy-saving over HID lamps.
Solid State, High Shock/Vibration Resistant
Work without ballast
No RF Interference
No Flickering
Instant Soft-start
Minimum Maintenance Costs
Produce Little Heat
Reduced Risk of Fire Hazard
No Mercury and other Hazardous Materials, fully RoHS-Compliant.

Today's advanced LED Grow Lights will pay for themselves in energy savings over their very long lives and will repay in multiples on the quarterly replacement cost of HID bulbs.

Nasa Studies of Astroculture Plant Growth Chamber, indicate that the Red/ Blue ratio used in most commercial LED Grow Lights, were used in these studies. The solution used in Astroculture is lighting provided by high intensity light emitting diodes (LEDs). To make the lighting as energy-efficient as possible, only the wavelengths needed by the plants are incorporated into the LED light caps. Plants require light at about 670 nm (red) for photosynthesis and a small amount at about 470 nm (blue) for development and for proper orientation in the near absence of gravity.

According to a University of Minnesota Study LED lights would have the potential to greatly increase energy use efficiency of commercial greenhouse lighting, thereby passing on significant savings to growers and consumers. While the initial investment in LED lighting is higher ($1,760) than HID lamps ($400), the cost-savings over a 7-year period are $2,291 due to their lower energy use and bulb longevity.  NOTE: Costs for LED Lighting have gone down, while energy costs has increased since this study was released.  Some results of this study in the two Charts below.

Natural Light - LED - HID Comparison

Observed Benefits

The above Study of LED Grow Lights, and the manufacturer claim found below, suggests that perhaps additional gains may be had with an increase of the Blue color spectrum during the growth phase, if you seek denser growth.  The University study indicates that Red light only produced plants with greater distances between branch internodes and softer, less dense, growth, whereas, the Blue alone tests produced plants with less space between the internodes and denser, stiffer leaf growth.

One Manufacturer claims that:
"The most important benefit to LED light is that you have full control over the wave lengths of Red and Blue light ! The amounts of Red and Blue light can be precisely controlled. Light can be placed exactly where you need it most. I have placed a Red LED right against the surface of many plants actually touching the areas most likely to produce a flower including orchids, and few days later flower buds started to form! Amazing!!! The level of growth manipulation and control that LEDs can offer the grower are only just now being barely explored. We have manipulated tiny seedlings with excess red light and in just weeks watched them burst into flowers. We have controlled annuals with excess Blue light into thinking summer was never going end and made the last for many years while turning them into monstrously large plants! LED growing is in its initiatory period and much more will be learned in the exciting years to come!"

We are convinced that this manufacturer is onto something!

Chlorophylls and Carotenoids
Two types of chlorophyll are found in plants and the green algae.

* chlorophyll a and
* chlorophyll b

Both chlorophylls absorb light most strongly in the red and violet parts of the spectrum. Green light is absorbed poorly. Thus when white light shines on chlorophyll-containing structures like leaves, green light is transmitted and reflected and the structures appear green.

In the chloroplast, both types are associated with integral membrane proteins in the thylakoid membrane.

Chloroplasts also contain carotenoids. These are also pigments with colors ranging from red to yellow.

Carotenoids absorb light most strongly in the blue portion of the spectrum. They thus enable the chloroplast to trap are larger fraction of the radiant energy falling on it.

Carotenoids are often the major pigments in flowers and fruits. The red of a ripe tomato and the orange of a carrot are produced by their carotenoids.

In leaves, the carotenoids are usually masked by the chlorophylls. In the autumn, as the quantity of chlorophyll in the leaf declines, the carotenoids become visible and produce the yellows and reds of autumn foliage.

Seasonal Color Theory:
Outdoor Sunlight produces a full but seasonally shifting spectrum of light, during the long summer days when the sun is high overhead the sunlight is of longer duration, greater intensity and contains a higher content of Blue light, HID lamps color rendering index does not mimic this season's index closely enough, HID lamps produce largely Yellow light which is not very useful to growth and harmful UV and IR. levels, about 25% of the energy is useful.  In greenhouses and outdoors, the long lighting period, the intensity and color content all effect the amount of growth experienced during the summertime.

During the late summer, fall and winter, as the sun appears to become closer to the horizon, the light passes through the atmosphere at a progressively sharper angle, through thicker air, and is filtered by this lens to have a higher content of Red.  This high Red content is what the LED Grow lighting is meant to supplement, to enhance this beyond the natural state and cause a lengthened window to achieve larger and more prolific blooms.

RED or BLUE Boosting?:
It may be inferred that the higher Blue light content of the lengthened hours of summer might be more closely simulated with the addition of more supplemental Blue LED lighting during the vegetative growth period, this is known as "Blue Boosting".  But one must ask, "Is it really necessary with highest quality lights?  The answer, your real world experience with your particular species will teach you what they prefer.

Our New Standard LED Grow Lights, when used alone, produce small compact plants that tend to bolt before and upon entering an extended bloom cycle.  Our manufacturer suggest their LED Grow Lighting is for for supplemental indoor use, as greenhouse supplemental lighting to enhance and lengthen the Bloom cycle.  Our experience is that these High Quality Standard lights really work, and work well particularly as supplemental light for better spectrum control.

We offer 150 Watt100% RED and BLUE Booster Lights for those seeking spectrum and intensity adjustability to mimic seasonal variations.  It is great a choice for the truly discriminating.

Observations and Conclusions:
Designers and manufacturers world wide have, until recently, blindly accepted the conclusions of limited testing in low gravity conditions of NASA LED Grow Light studies, and promote lights using a 80% Red and 20% Blue ratio.  Our observations and testing prove greater effectiveness near a more optimal ratio such as the one provided by our manufacturer supplemental lighting.

The Bottom Line:
LED Grow Lighting will save considerable amounts of Energy and are better for the environment in multiple ways, our improved consideration of appropriate wavelengths and ratios provide superior products that will assure the maximum benefits for your critical projects.  Research has led us, our manufacturer, to provide supplemental LED lighting that more closely match the spectrums and ratios appropriate for healthy plant production, tests prove this out.

They are great for adding RED with Plasma lighting or further tweaking with standard commercial induction lighting, those that are not purpose built. 

Inda-Gro EDFL Lights are the first and only purpose built Induction lighting system anywhere that does not require spectrum enhancement.

Using the most energy efficient lighting is crucial to keeping your costs reduced over time, as energy prices inexorably edge up, make sure you consider all options before making such costly investments.

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Some products from other Websites you may find helpful!

WX-C-150 Series LED Grow Light
WX-C Details/Specs
The Lowdown on LED Grow Lights


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