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Due to urgent repairs currently underway at our warehouse from 10th of April until the 15th of April items purchased during this period will be despatched on Wednesday the 16th. We apologise for any convenience this may cause.

If you are already an indoor grower you are probably reading these pages because you are interested in how Envirolites can reduce your power costs, you're probably a bit sceptical but having just received your electricity bill you are wondering just how those couple of HPS lamps you are using have given you a debt the same size as a small African Nation. If you are a new grower you may have heard about the costs of running inefficient HPS lamps but you are more interested in the advantages of using Envirolites. Which ever category you are in I hope the infomation on this page and others in our Stuff section will help you to understand why all growers should be using Envirolites.
Just consider for a moment the plants themselves. They are basically small self contained chemical factories, taking Carbon Dioxide from the atmosphere, Water and Minerals from the ground and using those elements to build complex carbon structures. But that isn't all that is required, everybody knows you need sun light to get things to grow. The miracle of growth occurs when light falls onto the leaves and produces energy in the form of sugar.
The problem is, plants are really fussy about the type of light they like. Sun light is of course perfect, but using artificial light requires knowledge of how plants use light and exactly what kind of light is needed.
The manufacturers and sellers of HPS lamps bang on about the amount of Lumens their lamps produce, in truth this means nothing. A Lumen is a measurement of light visible to the human eye and has absolutely nothing to do with growing. The obsession with Lumens has probably come about because the HPS lamps they sell for growing are nothing more than modified street lamps where, of course Lumens or your ability to see is important.
The professional growing world rates grow lamps using PAR which is short for Photosynthetically Active Radiation.  This is basically the part of the light spectrum which is seen and used by plants. Envirolites are 100% PAR meaning the light they emit is precisely tuned to your plants needs.  HPS lamps on the other hand give off a wide spectrum much of it not even being seen by your plants and a whole bunch of it in the IR part of the spectrum (Heat), HPS manufacturers are always reluctant to quote a PAR rating for their lamps because it is so low, probably around 15% for most HPS lamp types. We have another page in our 'Stuff' section dealing with the direct comparison of the light produced by Envirolites and HPS lamps as well as the cost considerations so I won't go into detail here.
Plants need different types of light at different times in their development. Growing (vegging as it is sometimes called) requires predominently White / Blue light, and flowering predominently Red light. This is what happens in nature. In summer the sun is high in the sky and visible for many hours, at this time of year White / Blue light is in abundance and is when plants are growing fast. As summer draws to a close the sun is lower in the sky and Red light is in abundance, this together with the drop in duration of available light is part of the complex reason plants switch their efforts from grow to flower. This is why Envirolites are produced in two spectrums, the 6400K Blue/White lamps for growing and the 2700K Red lamps for flowering. This ensures that your plants get the right type of light at each stage of growth.
We recommend a mixed spectrum approach to growing with Envirolites. We have talked about growing and flowering and the type of light required for each activity but we find that stronger more productive plants are grown by mixing in a little Red light during growing and a little Blue during Flowering. So that, for example, when growing and using a large (200w or 250w) 6400K Blue / White lamp the mix is achieved by hanging a 125w Envirolite 2700K Red lamp using an Envirolite Lamp Hanger.
One of the most frequent questions I get asked is "what lamps do I need for my grow space...."  This is an almost impossible question for me to answer without specific knowledge of the growers own setup, given more information we do try to help but, as a general guide only, the following may help.
We generally recommend 125w Envirolites as a total light solution only for very small growing areas, if you are growing in an enclosed space like a cupboard or wardrobe (one of our customers produces the best radishes you can imagine from the cupboard under his stairs). The 125w 6400K lamps are useful in an array, using one of the Envirolite multi-lamp reflectors, for producing large numbers of cuttings and seedlings.  They also provide the perfect light for 'wintering' plants such as Bonsai which need additional light during our dismal winters. The 125w 2700K Red lamp is excellent when used as supplementary lighting, hung between plants using a plant hanger it can substantially increase yields in those bottom parts of the plant that get little energy from the main light source.
The 200w and 250w Envirolites are excellent lamps and can be used with confidence as a total lighting solution for a growing area of around 1 metre square. This is not a hard and fast rule and depends greatly on the size and quantity of plants you intend to produce. Always remember that plants sense and grow to the space available, crowding plants means a smaller yield per plant. The 200w lamps can also be used as supplementary lighting greatly increasing yields and the quality of crops and if used in the Envirolite multi lamp reflectors are great for bringing on smaller plants. There is a definite correlation between PAR Amps and yields and so the 250w Envirolite Super Lamps are designed to boost your yields to the best possible level.
I hope this hasn't been too long winded, I have tried to keep it short while including as much useful information as possible. The rest of this page contains a more detailed version of the above and is definitely worth reading, the more you learn the better your plants will grow. If there is something I have missed or you have questions specific to your own experiences then please email and we will try to help.
Happy growing,


Envirolite Technical Information

Lights & Plants

Plant growth, harvest, potency and even the time to flower are all dependent on the light they receive. Light quality, intensity and duration are all important. The following is a brief introduction to plants, light, lumens and PAR.

Light is a plant's food, nutrients are only building blocks for the plant cells but it is light that provides the energy ~ so how does it work?

When light falls onto leaves it triggers the process of photosynthesis, which in simple terms is the process of turning light, which is radiant energy, into chemical energy. The amazing process of photosynthesis, turning light energy into chemical energy, is one of nature’s wonders. This energy transfer happens inside the plants cell structures called chloroplasts. The basic components of chloroplasts are individual membranous sacs, which contain fats, proteins and pigments (stay with us ~ it's worth knowing!)

Pigments & Chemical Energy

Pigments play an important part. They absorb light in the photosynthesis process of turning light energy into chemical energy. Chlorophyll, for example, is an important pigment, which absorbs red and blue wavelengths. There are different types of pigment and each absorbs different wavelengths of light. The light absorbed by the pigment causes a reaction, which produces chemical energy (it makes electrons out of the light, and the electrons use their charges to make sugar energy for the plant)

For those interested in the current theory of photosynthesis, it works something like this ~

The chemical energy produced by the chlorophyll (pigment) from light is sufficient to split the water molecules apart. This provides units of hydrogen (H) and hydroxide (OH). The hydroxide combines with carbon dioxide, which is absorbed from the air, to produce carbohydrates, which provides the energy for plant growth. (and you thought there was nothing going on in your plants ~ for more details visit your library!)

So to summarise ~ light falls on the leaves which convert it into electrons and the plant uses these electrons (electricity) to make energy as sugar.

Light & Light Measurement

Light, its intensity, quality, its colour, spectrum, wavelength are therefore all-important factors, but how do we measure light and what are the most important components?

Light is measured in photons (which we, or at least I, do not really understand). Light actually hits objects, just like a spray of water, and the sun emits lots of light photons ~ to give you an idea of how many; the sun hits our body with over 12,000,000,000,000,000,000,000,000 photons every second and a plant needs about 20 photons to make a finished molecule of sugar.

So our scientists can count the number of photons hitting the plant and even predict how much of this energy will convert into flowers or fruits. Each industry has its own way of measuring light. Photographers use a light meter, the lighting industry uses lumens or lux and the gardening industry uses PAR. All are only measurements; the actual light coming from a lamp or the sun does not change ~ only the methods we use to measure are different.

Light Spectrums & Colours

Light from the sun is ideal but it's not the same as artificial light, where output quality, spectrum etc varies upon the type of lamp and how it is used. Many growers think that more lumens = better growth / yields, when in fact artificial light, even at its best in a HID or HPS lamp in not so good in terms of colours. Much of the light from the bulb is not used by the plant, mainly because it is not in the 400 to 700 nw (nanawave) spectrum, and plants can only see and use light in this range. Light quality and its colours are as important as lumens.

Light, as seen by plants, is not a single colour but separate bands of active colours and the plant senses each colour-band of light as a separate signal. Each band of colour has a different effect on plants and the following are only a few of the functions, which each band of light promotes.

Blue Light (350 - 500 NW) powers chlorophyll production, powers cell actively, energies the stomata movement and makes the plant follow light.

Green / Yellow Light (500 - 650 nw) ~ not much action from these bands of light.

Red Light (600 - 700 NW) makes sugar from CO2, powers chloroplast production, signals light and dark times among other functions.

Strong blue and red light photons (as above) are also needed for good carbon dioxide uptake.

The PAR scale measures all these coloured photons between 400nw & 700nw, the critical range for plants, as this is only range that plants can use light. If it is not in this range then it's wasted light.


For growers PAR is all-important ~ and as important as lumens! PAR stands for > Photosynthetic Active Radiation.

Photosynthetic, the light sensed by a leaf pigment.

Active, the light that causes the leaf pigment to become active for making energy

Radiation, another word for light & photon energy

PAR is a measurement scale used internationally as a metric light measurement and is becoming more and more relevant to growing and greenhouse light measurement. Why is it important to you?

PAR is the measure of light that a plant actually senses and uses, and it is the light the plant sees and can use that is more important then the actual output lumen of the grow lamp!

* A large HID lamp may give out loads of lumens, but if it's too far away from your plant most are wasted (remember light intensity diminishes with distance) In addition the light a plant can use from these lamps is limited because the plant cannot see or use it because it is in the wrong spectrum.

So the main value of the PAR measurement is that it is the only measure that takes into account the actual light and light colours that the plant uses to energise its pigments and generate sugar energy, and it’s the sugar that makes your plants grow and produce such sweet fruits!

PAR and Fluorescent Lamps

In the past fluorescent lamps were always known to have excellent 'daylight' colour output but not the same photon power as HID / HPS lamps. The spectrum from fluorescents was ideal for propagation/seedlings but not for real time growing, because they were small watt versions and did not have the lumen / photon output. (i.e. an average household fluorescent tube is only about 35 watts. Nice spectrum but low light output! )

HID and HPS lamps have large lumen / photon output but are poor on colours omitted, but these lamps were the best available lamps at the time. However they do generate lots of heat and can be expensive to operate. They also need separate ballasts, control contacts and systems.

Envirolite CFL Lamps (CFL = Compact Fluorescent Lamps)

The development of high-output compact fluorescent means you can now get the correct colour spectrum, always associated with fluorescents, but with much higher light output. This means that CFL's are now capable of much, much higher lumen output with all the benefits of the ideal, spectrum output.

Photon strength is still not as strong as HID Lamps (although with our new reflectors we are getting there) but because these new lamps generate much less heat they can be placed just inches of the leaves, and this is a very, very important factor when using grow lamps

Light Intensity

Light intensity diminishes the further it has to travel. This is the same for HID, CFL or your normal household lamp. If you hold a light meter up close to any lamp and then slowly lower the meter, even a few inches, you will see the light measurement reduces dramatically. (If you can borrow, beg, steal or get access to a light meter please try this ~ you will be extremely surprised at the rate at which the light intensity reduces over a short distance)

Light from an HID or HPS lamp reduces by half for every foot it is away from the plants. So if your lamps are 2' or 3’ above your plants much of the light is wasted. The problem with HID lamps is they are so hot you cannot place them close to your plants and much of the light, and your money, is wasted.

One benefit of using high-out put CFL’s is that they do not generate as much heat and can be kept almost on top of the plants producing the exact 100% PAR light, with no loss of intensity. So if you position these new lamps close to the leaves you get the benefit of 100% PAR light in the correct 400nw to 700nw range, giving the plant the correct light colours and light quality.

Growing With Envirolites

Envirolites can be used to grow seeds and to propagate cuttings. They can also be used as the main lighting system for plants in the vegetative and flowering stages.

The secret to growing with Envirolites is to position your lamp or reflector just an inch or two above your plants.

(We use Easy-Roll Reflector Hangers and adjust the reflector height a small amount each day or so. We keep our Envirolite no more than 1" above the plant top.)

Positioning these new compact lights directly above the plants maintains light intensity, no lumens are lost and the PAR / Spectrum is 100%, which is like natural sunlight. The plants get all the lumens they need with the light being in the correct spectrum.

Envirolites are available in 2 models: Red 2700k (kelvin) and White 6400k (kelvin)

Red 2700k 125w, 200w and 250w lamps are used mostly for flowering. Many growers also use these lamps as a supplement to ‘hang’ by the side or in between plants when flowering. They can be used with HPS lamps, as a supplement or by themselves. We use them 100% and no longer use HPS lamps.

White / blue 6400K 125w, 200w and 250w lamps can be used for propagation and vegetative growth.

Some red light in the vegetative light mix is also recommended, as is a little white / blue light in the flowering mix. With different combinations of red and white lamps growers can obtain the ideal lumen output and spectrum required for excellent results in all stages of growing.

Envirolites provide 100% PAR, which is such an important factor and it is important to be able to calculate the PAR values obtained from your grow lights and how much light your plants need to give maximum yield. If you are using HID / HPS lamps you should contact your supplier and ask them about PAR output, it is important that you know this as well as lumen output.

These brief notes are to only give you a very brief introduction into how plants work, how light is measured in horticultural world and the importance of PAR as well as lumens. I hope it stimulates you to learn a little more about lights, plants, pigment, PAR and produce!

Envirolite Summary

Envirolites are effective, energy-saving, reliable, low heat generating horticultural grow lamps, giving excellent results and lower operating costs for all indoor growers.

Plants need light in the correct spectrum, which is proven to be between 400 & 700 Nana Wave, and Envirolites produce high output light in exactly this spectrum. There is no wasted light, unlike HID and HPS lamps were much of the light cannot even be seen or used by the plant.

Envirolites give 100% PAR (Photosynthetically Active Radiation) high output light and are used successfully for all propagation, vegetative or flowering stages.

Envirolites do not generate excessive heat and can be used directly over plants. This is the secret of growing with Envirolites, positioned directly above, just 3 cm or 4 cm, the top of the plants! Unlike HID lamps, this new generation, grow lamps will not burn your plants.

This is a real advantage compared to growing with HID lamps, as there is no wasted light, which occurs when HID lamps are positioned high above plants. Envirolites give 100 % PAR, correct spectrum, high lumen light directly on top of your plants - where they need it!

• Self Ballasting Lamps - simple to install or wire

• 100 % PAR in the correct spectrum for growing

• Generates much less heat than HID Lamps

• Energy saving lamps give lower operating costs

• High Lumen Output ~ Long Life Operation

• 125w, 200w and 250w Envirolites are available in 2 models:

6400K for Propagation & vegetative growing

2700K for Flowering stage growing

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