Galaxyhydro’s 300W LED Grow Light is one of our top picks when it comes to indoor grow lights. Whereas a lot of grow lights require some expert knowledge to set up and manage, the Galaxyhydro is perfect for both growing novices and experienced growers. It comes at a low enough price point that makes it a great starting light for anyone who is experimenting with growing cannabis for the first time.

It’s one of the most budget-friendly LED grow lights we’ve found and makes a great, affordable alternative to 150W rated HPS or HIDs.

But with a lower price point, you have to expect that it may not be as powerful as some of its competitors. While it’s a great light, it doesn’t provide the maximum coverage that you would find with some of the higher-end grow lamps on the market.

That being said, for growers who have smaller grow tents or indoor gardens, this full spectrum grow light will definitely get the job done. It is an excellent choice for boosting the growth cycle of a few plants at one go.

Let’s dive into more detailed information about this model in the Galaxyhydro series and highlight some of the main reasons you would choose the Roleadro Galaxyhydro 300W grow light.

Product Highlights

  • Measures 15.8 by 8.3 by 2.4 inches
  • Weighs 7.8 pounds
  • 100 pcs 3W Epiled LED chips
  • Draws 140W +/-5% at 120V
  • Features Zener diode technology
  • Daisy chain connection

Product Review

Design and Durability

PAR Output and Performance

This model has a higher PAR value and a superior ratio of the light spectrum for your cannabis plants. PAR is very impressive.

At 12 inches, you have 716 μmol m−2 s−1, at 18 inches, you have 312 μmol m−2 s−1, at 24 inches, you have 223 μmol m−2 s−1, and at 36 inches, you have 96 μmol m−2 s−1.

The excellent PAR value ensures that your plants maximize LED light absorption and increase plant canopy penetration by 20 percent.

The superior PAR value will bring your seedlings to life in a matter of days.


The light delivers an optimal full spectrum with the following wavelengths: 470nm, UV 380-400nm, IR 730nm, white light, 650-660nm, 620-630nm, 610-615nm, 450-460nm, and 430-440nm.

Even though the full spectrum LED is not selectable, it has the most beneficial LED light that your plants desperately need.

The red light and blue light contained in this light spectrum will fast-track the plant growth of your plants and increase yields. At the same time, the UV light eliminates plant disease by killing bacteria.

The Galaxyhydro series features a solid made from fire-resistant housing and exterior components. The unit features an on/off switch and the power outlet as well as a connection for a daisy chain and a three bass cooling system.

It’s upgraded heat sinks work in combination with high-speed bass fans that deliver excellent cooling and heat dissipation for your plants.

The professional design also adopts a hundred pieces of high-intensity Epiled LEDs rated at 3W. These LEDs are the most effective because they do not heat up quickly, like the 5W and 10W LEDs.

The Zener diode technology used protects the individual LEDs. A burn out LED will not affect the performance of the rest.

Apart from having excellent heat insulation, the shell of this indoor plant grow light is also well-protected against dampness, rust, and corrosion.

This Galaxyhydro LED design also features dimmer technology. It has a dimmer located at the back of the unit, which allows you to adjust the brightness from 0 to 100 percent conveniently.

The dimmable light setting is a very innovative feature because it allows you to control the brightness at different growth stages of your plants. You can optimize for veg and flowering stage when you need to.

Pros and Cons


  • The dimmer design lets you adjust brightness for different growth stages
  • It has an optimal full-spectrum range ideal for all growth stages
  • 3W Epiled LEDs produces 25% additional nutrients for your plants
  • Zener diode technology protect functioning LEDs from the dead ones
  • A daisy chain outlet lets you connect up to five units
  • On/off switch eliminates the need for a timer
  • Energy-saving wattage draws about 140 watts from the wall socket for optimal power consumption
  • It works with most hydroponic systems
  • It comes with a 2 year warranty


  • The spectrum is not selectable or customizable
  • It does not have a broad reach and has a smaller footprint than others.

We hope you found some helpful information from this LED grow light review of the Galaxyhydro 300w series. What this model lacks in actual power, it more than makes up for in reliability and affordability making it a perfect light for growers just getting started on their indoor growing journey.

Scroll to Top