GalaxyHydro vs Mars Hydro: Which LED Grow Light Is Better?

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Roleadro ( formerly GalaxyHydro ) and Mars Hydro are two very popular grow light manufacturers in the cannabis community. Both companies have produced some very solid budget LED grow lights over the last few years.In this article, we’re going to compare the Roleadro GalaxyHydro 300w and the MarsHydro 300w grow light.Which light comes out on top? Read on to find out.

GalaxyHydro vs Mars Hydro: Quick Comparisson

[amazon table=”7830″]

As you can see from the comparison table above, the Roleadro GalaxyHydro clearly comes out on top.Both lights have the same actual wattage and consume roughly the same amount of electricity.However, the GalaxyHydro outputs slightly higher PAR at 18″ and also includes UV and IR wavelengths ( see below for why this is important). The GalaxyHydro also includes the ability to daisy chain multiple lights together and will cover a slightly larger area due to the less bulky design.The MarsHydro has a slightly better warranty, but this is the only feature where it prevails.Read on for the pros and cons of both lights, as well as a detailed comparison of features

Roleadro GalaxyHydro 300w – Pros & Cons

What we like

  • Reliable company and good, responsive customer service if anything goes wrong with your light
  • Ability to daisy chain multiple lights together if you need to cover a larger area.
  • Budget friendly price
  • checkIncludes UV and IR wavelengths which have been proven to penetrate plants  and provide bigger, more potent, yields.
  • checkThis light has a slightly larger coverage than the MarsHydro
  • check Higher PAR output that the MarsHydro

What I don’t like:

  • They advertise that this lights actual wattage is 400 watts when it’s only 150w. Not cool.

MarsHydro 300w – Pros & Cons

What we like

  • Reputable company that also seems to have great customer service, responding quickly to any issues customers have.
  • Budget friendly price
  • checkGood 3 year warranty

What I don’t like:

  • No UV and IR included in the spectrum. We’d really like to see this is the next version.
  • No ability to daisy chain multiple lights together.


In this section, we’ll break down and compare the features of both lights and decide which light does it better.

Actual Wattage

Both these grow lights have an actual wattage of 150 watts. Each square meter of your grow space requires 50watts for you’re plants to max out the photosynthesis process. Therefore, these grow lights are good for growing 1-2 plants in a 2×2 ft grow space.Winner: DRAW

PAR Output

PAR ( measured in μmol/m2/s ) is the part is the measurement of light that your plant actually uses to photosynthesis. Therefore, so we want to make sure our plants get the right amount of it.Here are the PAR values we’re looking for from a good grow light:Between 200-400 (μmol/m2/s) Perfect for your seedlingsBetween 400-600 (μmol/m2/s) Perfect for your plants veg stageBetween 600-900 (μmol/m2/s) Perfect for when your plant is starting to flower.Roleadro outputs 452 μmol/m2/s at 18″, which is roughly the distance you would have the light if it were flowering. MarsHydro outputs 445 μmol/m2/s at 18″. As you can see, both these lights could use a little more PAR output to really max out the photosynthesis process. However, they will still perform well for budget lights. Winner: Roleadro GalaxyHydro


A full spectrum LED grow light will take a seed all the way to flowering. Here’s what I was looking for:Blue light ( 440-470nm ) replicates long summer sun and promotes leaf growth during the veg stage.Red light ( 640-660nm )  replicates short Autumn sun, and is the key force in photosensitise .UV ( Ultraviolet ) wavelengths have an extra advantage, as they active the plants defence mechanisms which leads to increased THCIR ( infrared ) wavelengths generate the canopy deeper than standard red wavelengths and lead to increased leaf size sizeWhile both the MarsHydro and Roleadro have the perfect Red and Blue spectrums, only the Roleadro GalaxyHydro includes UV and IR​. Therefore, there’s only one winner here:Winner: Roleadro GalaxyHydro


Both these light have similar dimensions and power outputs, so you would expect their coverage to be similar too. However, the Roleadro GalaxyHydro has a slightly larger max coverage 3ft x 3ft ( probably due to the less clunky design ) which means ​more plant coverage.Winner: Roleadro GalaxyHydro

Power Consumption

Power consumption is important as it will have a direct effect on your energy bill at the end of every month. Both of these grow lights consume roughly 130w. That’s pretty low.To calculate how much these grow lights will cost you each month, you need to use the following equation:Cost of Electricity x Number of Hours On x (Watts / 1000) = Total Cost

Currently, the average cost of electricity in the US is $0.12 kW/h. Therefore, if we had this grow light running during the veg stage for 18 hours per day ( 540 hours per month ) then this grow light would cost us $8.42 per month in electricity – not bad at all.Winner: DRAW


The inclusion of a solid warranty period is vital when purchasing an LED grow light. It shows that the manufacturer is confident in the product and happy to replace it if anything goes wrong. I always recommend choosing a grow light with at least a 2 year warranty. MarsHydros 3 year warranty wins this one compared to GalaxyHydros 2.5 year warranty.

Winner: MarsHydro


After spending  over 7 hours researching both of these great budget grow lights. I can confidently say that I would choose the Roleadro GalaxyHydro 300w over the MarsHydro 300w. The MarsHydro doesn’t include UV and IR in its spectrum, which I feel are essential for good yield and potency. I also prefer the Roleadros slightly larger coverage, PAR output and ability to daisy chain two lights together if required.I hope you found this review useful when deciding between these two lights. Let me know what you think in the comments below 🙂

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James Alexander James Alexander
Hey, I’m James! The founder and head writer here at I started this site to share my passion and knowledge of all things cannabis. I used to work as a budtender in central Amsterdam, and have over 7 years of growing experience.

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