How many plants can you grow under a 400 watt HPS

Yield Lab 400W HPS+MH Air Cool Hood Reflector Grow Light Kit (Price: $189.95) — A 400w HPS light provides 55,000 lumens, while a 400w MH light generates 36,000 lumens. This light intensity is enough to provide coverage for 1 to 2 plants.

How much does a 400W HPS yield?

Best marijuana yield indoors In theory, the math is simple. 400 watts of an HPS grow light could lead to 400 grams (14 ounces) of weed at the end of the day. 1200 watts would lead to 1.2 kilos (42 ounces) of marijuana, etc.

How far should a 400 watt HPS be from plants?

For 400W HPS, the best distance from seedlings is between 12 inches or 30.48 cm (closest) and 19 inches or 48.26 cm (furthest). What is this? 400W HPS grow lights are the most commonly used HPS grow bulbs. These lights can cover around 16 square feet and produce high yields.

How much area will a 400 watt HPS cover?

400-Watt HPS grow lights are the most commonly used HPS grow bulb, covering around 16 square feet and capable of producing high yields. 600-Watt HPS grow lights are the most efficient HPS grow lamp. 600W HPS grow lights produce more light output per Watt used than other wattages and cover around 36 square feet.

What is better for veg MH or HPS?

Ironically, most HID grow light enthusiasts recommend using both MH and HPS grow lights. MH grow lights (metal halide) are suited best for vegetative growth and HPS grow lights are superior for flowering.

How high should HPS be?

HPS lights should not be placed inches from the plants, as you would place fluorescent lights; you should set HPS lamps higher, generally between 5 and 8 feet from the plants. Whether you have a reflector with your HPS light makes a difference for how close you can keep it from the plants.

How much heat does a 600W HPS take?

If you have a 600 Watt HPS lamp, the BTUs for that luminaire are the same as a 600 Watt LED. A single watt of power is equal to 3.41 BTUs so a 600W luminaire will produce 2,046 BTUs.

Can I veg with 600W HPS?

In response to the general question, can you use an HPS bulb for veg, the answer is yes. … Basically you can use just about any light out there for any stage of growth, the real question is how well do each bulb work for veg.

How do I know if my grow light is too close?

The first signs look like thin outlines on the outside of the leaves, so if you catch this quickly you will have a chance to avoid further damage. If some of the leaves start curling up, it might also be a sign that the plant is too close to the light. Good ventilation usually also helps with this issue.

Can you replace a high pressure sodium bulb with a metal halide?

Both Metal Halide and High Pressure Sodium bulbs are part of the HID family of bulbs. … These bulbs cannot be interchanged without changing their ballast, the regulating element in all light bulbs. Their operation is a bit different and they therefore require different ballasts.

Article first time published on

What's the best HPS grow bulb?

As a general rule, 400w HPS bulbs are the most common, 600w HPS bulbs are the most efficient, and 1000w HPS bulbs are the most powerful (but also the hottest).

What light do I use for vegging?

Most growers agree that for young plants through the veg stage of growth you will want to have a light source with a good amount of blue light or even white (full spectrum) lighting.

Is HPS better than LED?

LEDs are much the same. Though they’re generally more efficient than HPS (with some clocking 2.8 µmol/joule), some LEDs are less efficient than high-quality HPS fixtures, and they give you less light. … All too often, the µmol/joule rating on HPS products states the lamp efficiency, not the actual product efficiency.

Can you use HPS lights in a grow tent?

All You Need to Know About HPS (High Pressure Sodium Lights) For Growing. High-pressure sodium lights are a good choice because they emit a light that is stronger in the orange / red spectrum, due to their rich sodium content. Growing a young plant with HPS bulbs will ensure an impressive vertical growth.

Can you use HPS and LED together?

The way HPS lighting should be installed is so that the light overlaps so shadows are reduced, and light penetrates in a horizontal direction. Having a mix of both HPS and LED lighting provides an ideal distribution of both diffuse and directional light.

How much heat does a 400 watt metal halide produce?

For instance a 400 Watt Metal Halide High Bay lamp puts off 1,364 BTUs per hour vs. a 150 Watt LED High Bay puts off 511 BTUs/hr.

How do I keep my HPS light cool?

Air-cool the lamps. Directly cool your lamps with a separate ventilation system. Use a sealed hood for your lighting and run additional ducting to directly cool the lamps (as a bonus, place dry ice above your lamps to help cool them and add CO2 to your grow room).

What is the best 600w HPS bulb for flowering?

ProductDetailsOur Top PickUshio HPS LampBest Value Optimized for floweringCheck Price ->Digilux HPSBest Quality More ExpensiveCheck Price ->Eye Hortilux HPS25% more blue light 1 year warrantyCheck Price ->PlantmaxInexpensive Option Slightly less outputCheck Price ->

How far from plants should grow lights be?

When it comes to HID grow lights, it’s best to keep them at least 12″ (30cm) away from your plants at all times. The stronger the light, the further you’ll need to hang it, so if you have a 1000w you may want to hang it at least 15″ (38cm) away.

How close do grow lights need to be to house plants?

Fluorescents should be at least one foot away from your plants, so as your plant grows be sure to adjust the height of the grow light. LED lights give off almost no heat at all, so it’s safe for houseplants to grow within 6 inches of them.

Can plants burn under grow lights?

Light, even intense light, probably won’t burn your plants. If a plant is getting too much light, it can challenge your crops and be counterproductive, but it won’t actually cause burning. … Usually, it’s the heat that burns your crop, causing tissue death and crop losses.

How high should grow lights be above seedlings?

Where Should Grow Lights Be Located? For seedlings, LED grow lights should generally be mounted between 24-36 inches above the plant canopy – however, this depends on the power (wattage) of the light source.

Can plants burn under LED grow lights?

The reality is that modern LED grow lights can produce a very high level of light and it can cause photo-bleaching and burn leaves. This depends very much on the plant, but a PPFD of 800 is enough to damage some plants.

How many watts veg stage?

Veg Room Set Up A good rule of thumb is that between 10-20% of your total light wattage in the Flower Room will be used in vegetative growth. This means that if there are 50,000 watts in the Flower Room, there should be between 5,000 and 10,000 watts in the Veg Room.

How much can a 600w HPS yield?

If someone catches you, you only have four plants to your name. Either way, growing four plants using a 600-watt HPS lamp could produce about 150 grams or 5.0 oz per plant. Sixteen plants that are grown under a 600-watt HPS lamp could produce about 37.5 grams or 1.3 oz of marijuana per plant.

Is CMH better than HPS?

By comparison, HPS and MH lights waste a lot of energy producing light at ranges that are not efficiently used by plants. This means that CMH are more PAR efficient than either HPS or MH, making them a better single light solution. They also have a more natural CRI (Color Rendering Index).

What is the difference between MH and HPS bulbs?

Metal Halide (MH) lamps provide more of the blue spectrum, which is ideal for leafy crops, and/or plants that are in a vegetative stage. … High Pressure Sodium (HPS) lamps provide more yellow/red spectrum, which is ideal for most plants that are actively fruiting and flowering.

What's better HPS or metal halide?

HPS is about twice as electrically efficient as metal halide. Photosynthetically Active Radiation (PAR) is what really matters to plant growth, and delivery of usable PAR is better with HPS than metal halide. … Metal halides deliver, on average, about 80,000-110,000 lumens per standard 1,000-watt bulb.

What is the difference between mercury vapor and high pressure sodium?

High pressure sodium produces a more neutral white light. Mercury vapor bulbs produce light with a distinct blue tint to it. In many countries, including the USA, mercury lighting is being phased out in favor of the more efficient types of HID bulbs.

What is Super HPS?

The EYE Super HPS™ EN Grow Lamps provide 17% more total energy and 25% more energy in the violet, blue, and green spectrum than standard High Pressure Sodium lamps. These lamps are environmentally friendly and pass EPA, TCLP test criteria as non-hazardous waste. Completely lead-free. Made in Mentor, Ohio USA!

Why do I need a ballast for a HPS light?

The ballast ensures that the lamp only receives the current it needs and nothing more. Without the ballast to regulate the amount of electricity going into the bulb, the light would continue to increase in intensity until the bulb blows. … The ballast automatically increases the amount of power to the bulb as it ages.