The light-emitting principle of MH light and HPS light and their role in cannabis cultivation
The full name of MH light is metal halide light, and the full name of HPS light is high pressure sodium light. Combining these two lights, one responsible for the growth period and the other for the flowering period, is the choice of many professional growers. Its cost is moderate, but the benefits it brings are the highest of all lights.
The metal halide light, the principle of light emission is to energize mercury vapor and bromide metal vapor contained in a quartz tube to make it glow. The light efficiency is 65~140lm/w, and the life span is about 10,000 hours. The emitted spectrum is very suitable for the growth stage of plants, usually used for growth before the pre-flowering period, and many people use it for the whole planting period.
The high-pressure sodium light emits a warm yellow light. The light-emitting principle is similar to that of a metal halide light. The light efficiency is slightly higher than that of a metal halide light, and the life span is about 15,000 hours. Warm yellow light is like autumn light, very suitable for plants after the pre-flowering period, and will greatly increase the production of THC.
These two lights are generally considered by cannabis growers to be the most efficient lights for planting, allowing plants to grow taller and produce dense flowers, which can greatly increase the production of THC. It is a high-intensity discharge light and consumes a lot of electric energy. Because the heavy metal salt in the arc tube must be vaporized before the power is turned on, and the vaporization will continue to be maintained, a lot of heat will be generated throughout the discharge. The emitted light is stronger and more penetrating, which is suitable for small-scale indoor planting and large-scale greenhouse planting. The light they emit is not only suitable for the growth of marijuana, but also emits very little ultraviolet light, which is less harmful to the eyes. Their emission spectrum is mostly in the visible range of the eyes, which makes us more comfortable to watch. Because the light intensity is large enough, we can just hang them high, without adjusting the height with the growth of the plants.
Precautions and selection tips for using MH lights and HPS lights
We also need to pay attention to several problems with high-intensity discharge lights. Continuous heating during the light-emitting process will cause excessive temperature. To prevent this problem, we must be equipped with a heat dissipation system. In order to maintain a stable electricity supply in the arc tube steam, we must be equipped with a ballast. Choosing a suitable ballast is the most important part of high-intensity discharge lights. In order to save the light source, we can also equip a reflector. In addition, we can also be equipped with timers and planting tents and other supporting facilities.
First choose the right bulb, the common bulb power on the market is 250W～800W. The greater the power is not the better. When choosing a high-intensity discharge light, we must consider whether the light intensity is suitable. Here is a simple reference.
|Lamp power||nearest height||suitable height||farthest height|
|150W-Covers 2’x 2’ (0.6mx 0.6m) area|
|250W-Covers 2’x 2’ (0.6mx 0.6m) area, up to 2.5’x 2.5’ (0.8mx 0.8m)|
|400W-Covering 3’x 3’ (0.9mx 0.9m) area, up to 3.5’x 3.5’ (1m x 1m)|
|600W-Covers 3.5’x 3.5’ (1m x 1m) area, up to 4’x 4’ (1.2mx 1.2m)|
|1000W-Covers 4’x 4’ (1.2mx 1.2m) area, up to 5’x 5’ (1.5mx 1.5m)|
|Light intensity level of cannabis growth|
|Plant period||70,000 lux||40,000 lux||15,000 lux|
|Flowering period||85,000 lux||65,000 lux||35,000 lux|
After selecting the bulb according to the planting scale, we must choose the ballast. The ballast has a built-in version, a separate external version, MH-specific, and HPS-specific. Choose the matching ballast according to your own bulb to provide a stable arc for the bulb. When choosing a ballast, remember that the power cannot be less than the bulb, otherwise the current of the bulb will burn the ballast. When we choose the ballast, we try to choose a ballast with a slightly larger power and suitable for both lights. Excessive ballast power will shorten the life of the bulb. Recommend good quality digital ballast, low power consumption, low temperature, and can achieve bulb compatibility, currently there are dimmable composite ballasts on the market that can set the lighting time, it is also a very good choice.
The above two choices are the two most critical choices in the high-efficiency discharge system. You can’t buy second-hand ones when you buy. Read the manual more. When choosing the power, not only the rated power is appropriate, but also the actual working power. After the configuration is complete, you can buy two more light bulbs for spare after confirming that the operation is correct. Switch lights as little as possible during use.
In order to maximize the use of light energy and prevent excessive heat from the bulb to the roof, we also need to equip a reflector.
The cheapest and simplest reflector has a plug that can be connected to the light and the ballast. The reflection efficiency is high, but the heat dissipation is not good. With this kind of lightshade, you must pay attention to whether the cooling system can take care of it.
The heat dissipation effect is good. Ventilation pipes and fans can be connected to both sides to enhance the heat dissipation of the light. But the reflective efficiency is not good, and it may cause the light to focus and burn the plants.
It can not only reflect light effectively, but also effectively ventilate heat. Install heat pipes and fans on both sides. It is the best reflector at present.
The above is the configuration of high-efficiency discharge lighting, the most important thing is to prevent overheating, short circuit or overload during use. If you are a novice, you can choose the overall package if you really don’t understand. And in the process of use must be equipped with dry powder fire extinguishers, long wooden rods or long rubber rods to prevent fire and electric shock. When the lighting system is turned on, be sure to be guarded. Always observe the plants to prevent excessive light from burning the plants. The monthly electricity bills of hundreds of dollars generated by using these lights are the most troublesome and often cause unnecessary attention.
Carefully ensure that each link is safe and smooth, and then you will get thick and tall cannabis.
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