LED Grow Light Placement and Coverage (Mars Hydro Review)

Today we’re looking at mid-tier LED grow lights in detail. This is a section of the market that’s highly competitive as new growers get into hydroponics and indoor gardening.

In this video we’ll talk about the Mars Hydro Reflector-Series 480w LED grow light, with toggle-able switches for vegetative and flowering lighting modes. Is it a good value? Let’s find out.

We’ll also cover grow light placement, the inverse square law of light, and considerations like coverage and lumen output.

* Today’s video is sponsored by Mars Hydro. Sponsorship in no way guarantees a favorable review. My take on a product and its value is 100% my own.


Epic Gardening is much more than a YouTube channel. I have a website with 300+ gardening tutorials as well as a podcast where I release daily gardening tips in five minutes or less. There’s also a Facebook group with over 1,500 other gardeners sharing their tips.

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39 thoughts on “LED Grow Light Placement and Coverage (Mars Hydro Review)

  1. Just wondering if the light turns off automatically after 20 hours or do you have to turn it off manually? Help!

  2. Can you do a video on how you grow on led lights from seed to harvest? I've looked through your videos and didn't see one.

  3. This light is garbage i got one and the light was nothing its just a waist of money 💰 do not buy this led there are way better ones out there the spectrum of this is waked it will make your plants grow funny due to the way they have the spectrum set up

  4. I have a question for you man so I have 3 led lights one of the leds has cobs it is 250watt at the wall and the other 2 are just your regular dual chip leds 200watts each at the wall. I'm putting all 3 of them in the same space. how should I spread these lights out so I'm getting a even coverage from the lights? should I put the more powerful led in the middle and the less bright ones on each side of the brighter light? let me know

  5. What I've learned from growing is by keeping the light set to veg state, you can actually trick the plant into growing 'bigger'. Then when you are ready to switch over to the bloom/bud, you flip the lights over which tricks the plant into thinking its time to bud… Also another trick is the times to keep the light on vs off. Longer blue/purple light time, and less red times!

  6. I found one for $107 I have my states legal limit of 4 plants, this is my first time growing…is this a good deal? And should I get it,on a tight budget for my project

  7. @Epic Gardening i got a 600w similar led for 2 flowers.so i switch both veg and bloom light all the time on from the get go ????

  8. Man I would love to have a light like that im in need of a light bad the only light i had left it was / and i was in the hospital and a wire got sucked up in it and burnt it up just about started a fire if anyone could help. Me out with a grow light i wil do a mail call video and a shout out on every video i need one in a bad way i got 7 plants that hasnt even got that much lightin the last week and a half my email is Davidntoni420@gmail.com please shoot me a email and let me know and whoever helps me out jhat as soon as my plants finish under the light i will send them a care package in return a fat care package and thats on my word!!!!

  9. Am using one off theses if both lights are one is it using a lot off electricity because o had them both on for 18 hours and it's used over £5 electricity surey they can't use that much and help would be great thanks

  10. I live in vancouver canada purchased this light from amazon. It came with a bad diode. Called customer support they said there was a repair depot in vancouver. I sent it there. And 2 days later they shipped me a brand new one. They were super apologetic. And now been running it almost 2 year. No problems. Great customer service they even followed up numerous times.

  11. Have to say, one of the Best reviews I seen. Alot good info, and thanks for trying to clear things up for buyers. You should add an ad at the end, rarely do I say that, but think you deserve some pay back. Thanks.

  12. You're supposed to use to bothh lights for flower… its not even an option. Veg needs less light than flower. No need for the bloom during veg. Save money on electric. I have the exact same one. Thinking of getting 2 more because seems the coolest in temperature compared to other LEDs I tried. Need more coverage, I want the electric sky by way to much money.

  13. Great vid. I used this light for two grows now, veg worked fine but the bloom mode at the correct height in instructions burnt the hell out of my plants both times even when raised higher for the second grow and got minimal buds, really disappointed and will sell it and try another for this winters grow

  14. Rice a Roni the San Francisco Treat Don’t like it kiss my mother fucking ass. Go Raiders. Pill Hill Merritt Hospital. I’m singing it right now

  15. Very inefficient and noisy. Get yourself a mars hydro sp250. Its much better technology. Also no purple light all white full spectrum.

  16. should use the 720 Mars II for that tent. I have the 960 with the with a 480 in my 4×4. 720 in my 4×2 and the 480 for my 27×27. Good solid product with gr8 results.

  17. how can one say 450W HID equivalent and mean by it that it acts like 250W HID , that makes no sesne if its 450W EQ , then it acts like 450W HID , but it doesnt , more like 250W as said so im not saying video is missleading im talking about their labels

  18. Hi. I use First Time mars hydro 144 led. I have 4 week plants end turn on grow an bloom or leav to grow lamps?

  19. How could you ever judge the performance of this light without measuring? You just can say, that it lightens up when plugging it in and switch it on.

  20. Bro my English is the worse , I just got one of those but bestva 2000 , it has 2 bottoms but I did not know I could use both at the same time …
    just if you can , can you tell me if I use 2 at the time for blooming it will be ok and also for veg station . I wanna know for what we use both bottoms on .
    Thanks mate and great video

  21. Thanks for the nice review. Can you recommend a mars light that is not particularly expensive and that will give the most "bang" for my buck? I was looking at the Mars Hydro TS 1000W but that is a relatively low end 150w option for £120. For a few extra £$£$ what would you suggest so I don't have to go and buy another one in a few months? Thanks again

  22. Nice review for the Mars Hydro MZ-96. My first LED grow coming up and I'm looking at the Mars Hydro MZ-144 or MZ-192 and matching tent straight from Mars Hydro on eBay.
    BTW – The plug on top is convenient for growers like me who put the electricity on the ceiling , or high on a wall, for water safety. According to the info they can also daisy chain up to three on a single power lead. Although I don't see the extra daisy chain plug in all the pictures. What's up with that?

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