HPS and MH bulbs are two of those types. All HID bulbs require a ballast to start and maintain the electrical arc, in addition to a reflector to house the bulb. For this reason, we always recommend buying a complete lighting kit instead of individual components, if you are just starting out. HPS stands for high-pressure sodium , which refers to the type of gas contained inside this lamp.
Bulbs containing sodium are often used in street lights, which is why those generally have a yellowish glow. When it comes to growing plants, HPS bulbs are the preferred type, especially during the later stages of growth. In those stages, plants will begin producing buds, flowers and fruits.
They want a lot of red-spectrum light at this point in their light cycle, making HPS bulbs great, but not ideal. Other types of bulbs are better for flowering. MH stands for metal halide and just like HPS, it refers to the gas inside the bulb.
This light looks more natural to our eyes i. Plants want a lot of blue spectrum light during the early parts of their life cycle, when they are seeding and vegging. The light from an MH bulb promotes growth better than the reddish HPS light, making metal halide lamps ideal for the early stages of plant growth. It will result in spindly plants due to lack of blue light, which helps plants grow strong , but using MH during blooming is worse.
It has a fairly large negative impact on yields, because flowering plants really need that red light. Read this article for more on the effect of different colors of light on plant growth and development. While both high-pressure sodium and metal-halide bulbs have worked well to grow marijuana for many decades, the truth is that their spectrum is not ideal.
Combining the two makes it much better, but it is still relatively inefficient compared to some of the more modern options. These bulbs differ further depending on the type of gas they use to power themselves. An MH bulb is powered by metal halide, hence the name, while an HPS bulb is powered by high pressure sodium.
Both types of bulbs are associated with hydroponic lighting, and both contain several key components. Different gases produces different colors of light, so you can change up the kind of bulb you are using depending on the stage of growth your plants are in, as well as their particular needs at that time. HPS bulbs tend to have warm colors - think red, orange, or deep yellow, while MH bulbs are cooler - like blue or purple.
HPS bulbs are needed when your plants are flowering and setting fruit, while MH bulbs are better at producing lush foliage and vegetation. Above is an example of a grow side by side in the vegetative period. You'll notice MH provides much better results in the growth phase. HPS bulbs contain a ton of pressure, as well as liquidized sodium.
When electricity enters the bulb, an arc is created that travels from the ceramic arc tube in the bulb. Sodium vaporizes when it meets the heat from the bulb, and as temperatures increase, the bulb gives off the warm yellow light.
These tubes get extremely hot, and are often found in highway lights in addition to in hydroponic growing systems. These bulbs tend to have a crisper, paler color than HID bulbs. The arc tube in this kind of bulb is made out of quartz glass, mercury, and various combinations of metallic halides. These halides are responsible for producing the crisp blue light that help your plants thrive so well.
The tubes operate at high temperatures, and, in addition to hydroponic indoor gardens, are often found in places like warehouses or parking lots. They can deal easily with temperature fluctuations because they are coated with reflective powder.
This helps reduce stress and makes them last for a long time even under challenging conditions. Keep in mind that HID bulbs always require some sort of a reflector to make them more efficient, and that they can produce considerable heat.
You can see how that could be a fine lifetime depending on the purpose of the bulb. Halogen is completely safe. The HID lights, however, contain levels of mercury that could be a concern.
Metal halide lamps contain 38mg and the high pressure sodium bulbs contain 15mg. These are not exceptionally high levels, but if you are going to have these lights fairly close to people, there is a possibility of negative health risks. The HID lights are definitely the brighter lights. They produce approximately 58 lumens per watt. The halogen light bulbs produce around 20 lumens per watt. HPS bulbs seem to be the brightest option of the three, and they also last longer than the others as well.
This means there are a lot less thrown away. The impact of this is not as significant due to the fact that they are rarely recycled because they contain mercury. Metal halide lamps have been reported to give off more sky glow than the other options as well. Choosing which light you will use is dependent on your needs.
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