For example, Kind LED, based in California, advertises the PAR values at different spots in a grow room for all of its products. Under a single light, the PAR value can change considerably from the space directly below the light, to the perimeters of the light’s reach. With Kind LED’s LumiGrow light, PAR is measured at a total value of 1856 µmol/s, with the highest figure being read directly in the centre of the square metre measured.
On one side of the junction is a material that has been treated with extra electrons, while on the other side is material that has been treated to lack electrons. When voltage is applied, the extra electrons move across the junction to fill the “electron holes” on the other side.
HPS lighting is best used during the flowering stage of a plant’s growth cycle. This is because the spectrum of light emitted is conducive to flower production. LED lighting is also ideal for the flowering stage as they produce a lot of lumens. For most annual flowering species, the summer initiates flowering, a period of the year that is rich with sunlight. LEP lighting technology is still miles behind HPS and LED, and does not produce yields as big as other lighting systems.
However, new “full-spectrum” bulbs now exist, and often consist of a dual-arc system comprising both a metal halide and an HPS component. For example, the Hortilux Super Blue HPS/MH lamp comprises a 600W HPS and a 400W metal halide arc, giving 110,000 initial lumens and a far more accurate representation of daylight than HPS alone.
As light is one of the two most basic foods for any plant (water being the other), it naturally has a big impact on final yield. Annual flowering species follow very strict patterns of temperature, day and light hours, and light spectrum.
High pressure sodium (HPS) lights have been the heavyweight champion of the lighting world for decades now, with other lighting systems making only minor challenges to their supremacy. Here, we will take a good look at the their differences and what growers can expect from each type.
Let’s break down the different kinds of lighting and how they are best applied in indoor greenhouses. We also talk about the different times that different spectrums may be used, and the different ways this can affect yield.
Typically, growers begin a grow cycle with fewer lights. This ensure that seedlings and young plants are not burned by excess light and heat. Growers can increase the amount of light globes as the cultivation process progresses. This also ensures that there is sufficient light once plant size has increased.
- LED (light-emitting diode) lights are semiconductors, which allow electrical energy to pass with little resistance in one direction and overwhelming resistance in the other, across a “p-n junction”.
Starting an indoor greenhouse? You’ll need all the tips and tricks for choosing lighting. Let’s discuss the best lighting for yield and cost.