FAQ

The Basics

Do LED grow lights work?

The short answer is: yes, absolutely. While early adaptations of LED grow lights may not have matched the performance requirements of HPS or Metal Halide grow lights, LEDs have come a long way in a relatively short time. With increased efficiency, spectrum control, and reduced maintenance over traditional grow light systems, growers are quickly realizing the benefits of deploying LED grow lights. Another big advantage LED grow lights have over traditional systems is the ability to produce narrow-band wavelength light, thus targeting the specific lighting requirements of different types plants.

What are PPF and PPFD?

PPF stands for Photosynthetic Photon Flux, and is defined as the total number of emitted photons per second in the active PAR region. PPFD stands for Photosynthetic Photon Flux Density, and is defined as the number of photons in the PAR region emitted per square meter per second. PPF is a standard measurement in the grow light industry, measured in µmol/s (micromoles per second), while PPFD, measured in µmol/m2/s is a field measurement and can vary under different conditions.

Will LED grow lights damage my plants?

LEDs will not damage plants due to the low radiant heat emitted by the light. This is because LEDs have efficient heat sinks to draw heat away from the fixture. Often, traditional lighting such as HPS or MH generate high radiant heat, which may dry or burn the plant.

What is PAR?

Photosynthetic Active Radiation (PAR) designates the spectral region of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of photosynthesis. This spectral region corresponds more or less with the range of light visible to the human eye.

Do LED grow lights give off heat?

In the conversion from electrons to photons, energy is lost. One of the biggest losses is in generated heat. It does not matter if the light comes from an incandescent bulb, fluorescent tube, or LED; they all produce heat. LEDs make this conversion from energy to light more efficiently than other methods and therefore produce less heat, but they are subjected to the laws of Physics. Any conversions in one form of energy to another will result in energy losses.

What is the difference between using LEDs as primary lighting source and supplemental lighting source?

Supplemental lighting indicates that natural sunlight and LEDs are used congruently, maybe even at different times of the day. LEDs as primary lighting is usually deployed in specialized grow rooms, or indoor applications where LEDs can supply the plant all the light it requires. Such an example is vertical farming, where natural sunlight cannot reach all levels in the vertical farm, thus LEDs are used as the primary light source.

Why is light angle and distribution important?

Light angle and light distribution are very important factors because they determine the coverage area. Using the correct optical lens is a key factor in getting the desired coverage. Under-coverage will result in uneven light distribution on the plants, while over-coverage will result in unnecessary power loss as a result of too much light over the coverage area.

What is the best spectrum for my plants?

There is no one spectrum that works for all types of plants. Each plant is different and has different chemical compounds and morphology properties, and this needs to be considered when picking the right spectrum for a plant. Research has shown that Chlorophyll A and B, the main catalyst in photosynthesis in plants, respond to red and blue light the best, and thus the spectrums of many LED grow lights are built with a ratio of red and blue light. However more and more research is indicating that green light does play an important role in photosynthesis, and must be considered.

Why consider IP ratings?

This depends on the growing conditions the LED grow lights will be in. If there is significant humidity or watering systems working alongside the LEDs, it is important to prolong the service life of the LED grow light by making sure it is able to handle them. Some LEDs may use cooling systems involving fans, which may not be ideal for a humid environments.

Efficiency & Savings

HPS/HID Wattage Compared to LED Wattage.

The common ratio when comparing the equivalent wattage between the two types of lights is a 2:1 HPS/HID wattage to LED wattage. For example, many 1000W HPS/HID replacement LED grow lights are around the 500W range. However not all LEDs are made the same, and some are more efficient at converting electrons to photons than others. In general LEDs draw less power than HPS/HID systems, but it is important to find the right lighting recipe for your plants.

What can I expect when switching from HPS/MH grow lights to LED grow lights?

The first, most noticeable difference is the huge energy savings but many other factors will change as well. LED grow lights can be placed closer to the plants than other lighting systems due to the relatively low heat created by the LED lighting source, therefore LEDs generally won’t “burn” plants. There will be less transpiration from the plants as well, and water absorption changes due to low heat from the LED lighting source. To add the spectrums of LED grow lights are much better suited for plants, reducing their growing periods from seed to harvest.

Why are LED grow lights more expensive than HPS or Metal Halide grow lights?

LED grow lights last longer, consume less power, and have spectrums that are better suited for plants. Modern LEDs last about 50,000 hours, and the power draw is usually halved by switching from HPS or MH to LEDs. LEDs are able to utilize their ability to emit narrow-band wavelengths to target the specific needs of different plants.

LED grow lights are a plug-and-play system, which means they plug-in right out of the box without additional accessories such as reflectors, ballasts, or replacement bulbs.

Products & Purchasing

What warranty options are available?

All Lumenari grow lights come with a standard 3-year warranty from time of purchase.

Shipping

Shipping timeline?

Our shipping timeline varies based on region. If you are in Canada, you should receive your shipment within 20-30 days, U.S. shipping 30-45 days and international shipping 45-60 days post transaction.