How to choose the right size MH/HPS grow light for your grow room？

250W MH/HPS grow light
Coverage Area: 2′ x 2′ (0.6m x 0.6m) up to 2.5′ x 2.5′ (0.8m x 0.8m)

How Far From Plants? Keep 10+ inches (25cm) away from tops of plants

Average Yields: 125 – 250 g (4 – 8 ounces) – less for beginners, more for the pros – get the biggest yields by filling the entire grow area with a wide even canopy and remember that the strain (genetics) you grow with also makes a huge difference in your final yields

Notes: Some (but not all) 250W MH/HPS have a “Built-In Ballast,” which means everything is actually attached together and you just plug the light directly into the wall. Some 250W HPS lights have a traditional ballast, which means that the ballast is a separate piece from the hood/reflector. In general, it’s better to get a light where the reflector is separate from the ballast – they are more efficient, cooler, and spread their light over a bigger area.

400W MH/HPS grow light
Coverage Area: 3′ x 3′ (0.9m x 0.9m) up to 3.5′ x 3.5′ (1m x 1m)

How Far From Plants? Keep 12+ inches (30cm) away from tops of plants

Average Yields: 200 – 400 g (7 – 14 ounces) – less for beginners, more for the pros – get the biggest yields by filling the entire grow area with a wide even canopy and remember that the strain (genetics) you grow with also makes a huge difference in your final yields

Notes: 400W is one of the two most popular sizes for small-scale growers (along with 600W). A 400W grow light runs relatively cool compared to most other HID lights, but packs quite a punch when it comes to yields. Generally it’s a good idea to set up an exhaust for a 400W grow light to manage temperatures.

600W MH/HPS grow light

Coverage Area: 3.5′ x 3.5′ (1m x 1m) up to 4′ x 4′ (1.2m x 1.2m)

How Far From Plants? Keep 16+ inches (40cm) away from tops of plants

Average Yields: 300 – 600 g (10 – 21 ounces) – less for beginners, more for the pros – get the biggest yields by filling the entire grow area with a wide even canopy and remember that the strain (genetics) you grow with also makes a huge difference in your final yields

Notes: 600W is one of the most popular sizes for small-scale growers (along with 400W). A 600W grow light is the most efficient of all HID lights, which means it produces the most amount of light per watt of electricity. To prevent heat problems, I would not recommend getting a 600W light for a regular grow room without installing an exhaust setup or some other way to control temperature.

1000W MH/HPS grow light

Coverage Area: 4′ x 4′ (1.2m x 1.2m) up to 5′ x 5′ (1.5m x 1.5m).

How Far From Plants? Keep 21+ inches (53cm) away from tops of plants

Average Yields: 500 – 1000 g (17 – 35 ounces) – less for beginners, more for the pros – get the biggest yields by filling the entire grow area with a wide even canopy and remember that the strain (genetics) you grow with also makes a huge difference in your final yields

Note: 1000W is the biggest standard HID grow light size. A 1000W grow light is extremely powerful but can also get very hot. To prevent heat problems (which can adversely affect your plants), it is important to set up an exhaust setup or some other way to control temperature.

Best MH/HPS grow light

Gavita 906088 Pro 1000e

The Gavita 906088 Pro is considered the best HPS light in the market at the moment. It comes with a classic designed hood, and a dimmable ballast, which capable of adjusting between 600W to 1000W.

PROS

Uses universal voltage, 110v to 240v current.

With the use of the dimmable ballast, output can be controlled from 50% to 115%.

The unit can be daisy chained with other Gavita 906088 and connected to the controller. Up to 80 fixtures can be controlled by the Gavita Master controller. This saves the user the cost of timers and cables/contactors.

With the use of the Gavita Master controller, up to 80 fixtures can be connected via daisy chain and controlled by one controller.

The eSeries fixtures are plug and play and come with their own control cords.

CONS

Requires ventilation, as it generates heat during operation.

There are instances of bulb arriving broken due to mishandling during delivery.

We have designed one newest Light 820w solar led grow light (ct1930e) 1:1 replace that Gavita 1000W HPS.