Mars Hydro 300W LED Grow Light Review

The Mars Hydro 300W is an indoor LED grow light with a full spectrum range suitable for cultivating all types of plant. The light emits an overall voltage of 85V-265V AC and has a lifespan of 50,000 hrs, and it also emits safe white light that does not scorch the germinating seedlings.

Mars Hydro produces a wide range of LED grow lights in different wattages and formats. While this Mars Hyro review focuses specifically on the 300w LED grow light, many of the features carry throughout the product line. At the end of this review, I’ll also provide information about several other Mars Hydro grow light options.

Features of the Mars Hydro 300W

Easy to assemble

You only need to plug in the cord to turn on the grow light or unplug to turn off. The unit can also be fitted with an auto timer to control the level of light each plant receives per day. For most seedlings, it’s recommended to keep the grow light at heights of between 12 to 30 inches above the plants, according to their needs.

Cutting-edge design

The Mars Hydro 300W fitted with a robust internal cooling system that helps bring down temperatures when they are too high. The frame consists of silent, forced-air intake & exhaust fans as well as sizeable pin-cushion heat sinks that help regulate heat levels, thus ensuring the longevity of the product.

Epistar 5W LED chips

Mars Hydro uses Epistar 5W LED chips to help distribute light evenly for all plants so they can grow at the same rate without some germinating and others withering due to excessive light. These chips have an increased Par value which means adequate light will be absorbed by the plants for proper growth, development and yield.

Full Light Spectrum

MarsHydro emits useful wavelengths of luminosity that can quickly be absorbed by plants to foster the photosynthesis process. The full spectrum range ensures uniform lighting for the plants, which is useful for all stages of germination.

This product was developed following eight years of thorough research and testing, emerging as the most proficient spectrum for plant growth, even outperforming CMH, HPS, fluorescent and induction in similar wattage tests. It’s suitable for growing both vegetables and flowers.

Pros of the Mars Hydro 300W LED Grow Light

1) Safe and Environmental-friendly. The product has been tested and approved by various standardization bodies. It has also received the US authoritative ETL certification. The LED lights are built using a biodegradable material and do not produce any chemical or electronic odor while the light is running.

2) It comes with a 12-month warranty from the manufacturers, with support-centre assistance from their offices in California. Moreover, if you encounter any problems with the unit and require a refund, they offer a 30-day money back guarantee after you have purchased the grow light.

3) Energy-saving bulb for reduced power spending. This unit consumes only 132 watts on average, whereas other typical grow lights may consume as much as 150 watts for the same duration of time. It also provides flexible coverage in that only 4 Mars Hydro grow-lights are enough to provide illumination to an area measuring 4ft x 4ft squared.

4) Versatility. The unit can be used for both hydroponic growing and plants that are in soil, such as lettuce, potatoes, tomatoes, peppers, and so forth. It’s also suitable for an indoor germination environment such as grow room or grow tent.

5) Longevity. You can switch it on 24/7 throughout the day and night, and it will not overheat even after several weeks.

6) Exceptional quality of light. With all matters remaining constant, Mars Hydro can triple the size of your plants in only three weeks after planting. Most plants respond exceptionally well to the light output.

7) Quality control. Before shipment to the buyer, each unit undergoes testing 48 hours before packaging, minimizing the chances of defects and other errors. Customers are assured of a good purchasing experience and products that work immediately upon arrival.

8) Global recognition. There are more than 10,000 growers worldwide who have accepted Mars Hydro as their favorite grow light, they continue using it every day for their planting needs. When properly maintained, this unit can last for as long as three years without requiring any major repairs.

9) The product arrives quickly upon ordering online. It takes just a few days for delivery to your doorstep, the grow-light also comes well packaged from the manufacturers.

10) Easy control. You can turn the bulbs on and off repeatedly without worrying about a 15-minute cooldown. It’s possible to do regular tent work while the lamps are off, and then flip them on afterwards without affecting light quality or distribution.

11) The product is sturdy in build and comes with a sturdy casing consisting of a cooling fan. It’s also very affordable compared to other grow lights in the same category.

12) Exceptional for growing vegetables. It emits a gentle purple light suitable for growing veggies. The purple glow is also soothing and calming to the eye.

13) Excellent customer service from the manufacturers. The support desk is responsive and ready to answer any queries you may have concerning the product.

Cons of the Mars Hydro 300W LED Grow Light

a) The product can only be used indoors as it’s not waterproof

b) There are complaints that the spectrum consists of more white light than needed and there’s no easy switching for vegetable or bloom.

c) Sometimes a portion of the lights may begin to flicker after just three months of use. The diodes may also burn out unexpectedly.

d) The mounts are not correctly sized and hang too low. Additionally, the power cords are not long enough, and you may have to dig into your pockets to get much longer ones.

e) The item is manufactured in China and not locally made, although most of the top grow light brands are similarly Chinese.

f) You must maintain a stable voltage to avoid damage to the light fixture.


The Mars Hydro LED Grow Light is a useful tool for indoor germination of both plants and flowers. Unlike other products, it has a full spectrum range that provides adequate distribution of light for healthy germination. Furthermore, this product is very durable and can last for up to three years without developing any technical problems.

During delivery, the package comes complete from the manufacturers with the light, power-cable, and hangers. You can get more information on how to use it or how the light works by visiting the manufacturer’s official website or sending them an email through customer care.

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