Plant Lighting Lamps

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Plant Lighting Lamps
Plant Lighting Lamps

Video: Plant Lighting Lamps

Отличия серверных жестких дисков от десктопных
Video: MY GROW LIGHT SETUP | grow lights for houseplants | pros & cons 2023, January
Anonim

Efimenko Alexander Alexandrovich, a

practicing specialist in interior landscaping and plant care

Ending. The beginning is in the article Lighting for indoor plants.

Decorative illumination with LED lamps
Decorative illumination with LED lamps

Decorative illumination with LED lamps

Taking into account the needs of plants in a certain spectral composition of light is necessary with the correct selection of artificial lighting sources.

Lamps usually have color temperature markings (CCT). Marking - 2500K indicates that this is a lamp, which has more red rays in the spectrum than a lamp marked 7200K. On the first, sometimes they write - a lamp of warm color, on the second - cold. The table shows how the lamps are divided according to this indicator.

Another parameter of the lamp is the color rendering index (CRI). This parameter shows how close the colors of the illuminated objects are to the true colors. This value ranges from zero to one hundred. The higher this indicator, the more “natural” and attractive the plant seems. Marking / 735 - means a lamp with a CRI value of 70-75, CCT = 3500K - a warm white lamp; / 960 - lamp with CRI = 90, CCT = 6000K - fluorescent lamp.

Color temperature of different types of lamps

CCT (K)

Lamp

Colour

2000

Low pressure sodium lamp (used for street lighting), CRI <10

Orange - sunrise-sunset

2500

Uncoated high pressure sodium lamp (HPS), CRI = 20-25

Yellow

3000-3500

Incandescent lamp, CRI = 100, CCT = 3000K

Warm-white fluorescent lamp, CRI = 70-80

Incandescent halogen lamp, CRI = 100, CCT = 3500K

White

4000-4500

Cool-white fluorescent lamp, CRI = 70-90

Metal-halide lamp, CRI = 70

Cold white

5000

Coated mercury lamp, CRI = 30-50

Light blue - midday sky

6000-6500

Daylight fluorescent lamp, CRI = 70-90

Metal halide lamp (metal-halide, DRI), CRI = 70

Mercury lamp (DRL) CRI = 15

Sky on a cloudy day

In phyto-lamps, the spectrum is optimized for plants. At the same power, a special lamp gives more "useful" light for plants than a regular one. There are no green and yellow rays. Almost all the light is absorbed by the plant, its leaves do not reflect anything and appear black. In terms of energy saving, this is good. And that's not bad for plants. But the decorative effect is lost. If you install a more powerful lamp with a high color rendering index, then all the necessary components will be in its spectrum, and the situation will be corrected.

Characteristics of different types of lamps

Briefly about the advantages and disadvantages of different types of lamps in terms of their use as lighting devices for indoor plants.

Incandescent lamps give light with spectral characteristics close to sunlight. But more than 90% of all energy consumed goes into heat, so the leaves of plants around them dry out. When water drops hit them, they burst.

Incandescent lamps
Incandescent lamps

Incandescent lamps

Incandescent lamps
Incandescent lamps

Incandescent lamps

Lighting with halogen lamps in the greenhouse
Lighting with halogen lamps in the greenhouse

Backlighting with halogen lamps in a greenhouse Halogen light sources are incandescent lamps, in the cylinder of which halogen vapors (bromine or iodine) are added. Their light has a satisfactory spectral composition, approaching the sun, almost the same as that of conventional incandescent lamps. They require additional protection from dirt, accidental touch and contact with low-melting materials, moisture. They give off a lot of heat. Good for selectively illuminating a subject.Fluorescent lamps(daylight, tube). A gas-discharge light source in which an electrical discharge in mercury vapor creates ultraviolet radiation, which is converted into visible light using a phosphor - for example, a mixture of calcium halophosphate with other elements. They have a satisfactory spectral composition. More economical than incandescent bulbs. They transfer dirt and water droplets when spraying plants. Requires special fastening during installation.

Fluorescent lamps
Fluorescent lamps

Fluorescent lamps

Fluorescent lamps
Fluorescent lamps

Fluorescent lamps

Phytolamps, usually the same gas-discharge fluorescent tubes, give light that is almost completely absorbed by the green leaf. Plants do not look attractive in this light, but they grow quite well. Quite economical.Compact fluorescent lamps are often referred to as energy efficient lamps. As a rule, these are lamps with a standard base (E27). They also have a satisfactory spectral composition. Low amount of heat generated. Ability to tolerate dripping moisture. They are mounted in standard lighting structures.

Compact fluorescent lamps
Compact fluorescent lamps

Compact fluorescent lamps

Compact fluorescent lamps
Compact fluorescent lamps

Compact fluorescent lamps

DRI - high pressure metal halide lamps have a high luminous efficiency and, from the point of view of the human eye, better spectral characteristics than HPS lamps. Like other types of discharge lamps, metal halide lamps require special discharge initiation devices (ballasts), sometimes called ballasts. Short-term interruptions in power supply cause extinguishing of MGL. Severe vibration, especially hazardous to long-arc lamps operating horizontally, can cause the same result. Dangerous for MGL is acoustic resonance that occurs when the lamp is supplied with alternating current of a certain frequency (in the acoustic range). HPS lamps(high-pressure sodium lamps), are used with a ballast (ballast) and have the highest luminous efficiency among all gas-discharge lamps. The former complicates installation, the latter reduces power consumption in terms of watts per lux. They are used in industrial plant growing, giving light with a spectral composition close to the sun.

HPS lamp with E-27 base from Reflax
HPS lamp with E-27 base from Reflax

HPS lamp with E-27 base from Reflax

LED lamp
LED lamp

LED lamp

Light-emitting diode lamps (LED). Their main advantages are high luminous efficiency (efficiency - 0.68) and relative durability. But the luminous flux of LED lamps is still low. Their spectral characteristics are rarely suitable for plants. Warm white LED lamps (FaOm-8W-ww) have Ra = 83. Their weak point is the color rendering of red (R9) and blue (R12) colors. Warm white LED bulbs outperform warm white compact fluorescent bulbs in terms of yellow-green (R3), yellow (R10), blue (R12) and dark green (R14) colors. But these very colors are not consumed by plants. There are LED lamps with "color corrected", where the color rendering is improved and the light of a red LED with λmax = 625 nm is added to the blue LED with a yellow conversion phosphor. Perhaps the future belongs to them.

In our opinion, today energy-saving lamps, which provide convenient installation and give good spectral characteristics in terms of plant life and decorativeness, will be optimal for indoor lighting of plants. When lighting conservatories, it is better to use HPS lamps, which are also available with a standard E27 base. Their ballast devices (ballast devices) can be placed at a sufficient distance from the light source and well decorated.

Day length

The important characteristics of the light regime are its daily and seasonal dynamics. The length of daylight hours (photoperiod) varies throughout the year. In temperate latitudes, the shortest day is 8 hours, and the longest is more than 16 hours.The location of the windows and the amount of light

Most plants need sunlight for planting flower buds, flowering and ripening fruits, but there are some that need darkness.

According to the degree of relation to the light regime, plants of a long day are distinguished, which can bloom and bear fruit with the onset of a long light period and a short night, i.e. from early spring to early autumn. Radish is a well-known example of such a plant in mid-latitudes. Please note that fruiting is not the formation of a root crop, but the formation of seeds. Of indoor plants, the most famous are: hydrangea, gloxinia, saintpaulia, calceolaria, cineraria.

Short-day plants (zygocactus, Kalanchoe, azalea, poinsettia, etc.) need 8-10 hours of daylight to bloom. Long daylight hours cause increased leaf development in them, promotes photosynthesis, and the accumulation of vegetative mass. Plants that are not demanding on the length of the day bloom both with long and short daylight hours (roses, ever-flowering begonia, abutilon). There are plants that bloom only after alternating long and short days, when short winter days are replaced by long spring ones (pelargonium large-flowered) or require reverse alternation, i.e. bloom only in winter (camellia, cyclamen).

You can adjust the length of the day with different types of timers.

Sometimes, when decorating an interior, the rules of aesthetics require a certain placement of plants, which does not completely meet the requirements for lighting. In these cases, plant species are selected that can withstand the absence of light for a longer time, or after some time some plants are replaced by others. It may be preferable to use artificial or stabilized plants under these circumstances. But that's another story.

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