Grow Light distance from plants | Efficiency Vs Uniformity

The best grow light distance from plants is a compromise between:
Hanging the grow light as close to the plant canopy as possible to maximise the amount of light reaching the plant (most efficient grow light setup)
&
Hanging the grow light high enough to distribute the light evenly across the plant canopy (for best uniformity)

For the following grow lights:
Viparspectra XS1500 in a 2x2 or 60cm x 60cm grow area
MIGRO ARAY 4 PRO in a 4x2 or 120cm x 60cm grow area
Spider Farmer SF7000 in a 4 x 4 or 1.2m x 1.2m grow area
HLG 600Rspec in a 5 x 5 or 1.5m x 1.5m grow area

In each test I look for the maximum PAR to be in the range of 1,000 to 1,100 µmols/m²/second and the lowest PAR reading, usually in the corners, to be no less than 60%of the maximum, ideally 80% for the best uniformity.

#ledgrowlight
#migrolight
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[aladinvisuals]

im saving to buy the Aray 4 for my 2x4 even if there might be something better out there in the market just for the simple reason that Shane has been so transparent and honest with his reviews and for being an amazing person, i feel like the light value goes beyond the product itself.

[LEDGardener]

Well done, Shane. You've got a knack for breaking these things down to simple terms and numbers so everyone can understand. Keep up the great work.

[MattUSA]

I use the Grow300. I like to hang the light high as I can in my tent. And dim the light up or down using the PAR reader spotOn. I start about 200 with seedlings and adjust the par reading from there.

[GlenBixley]

Hello from New Zealand, you channel provides some great knowledge, We appreciate the time you put into these Videos Thanks.

[wrh]

Excellent information Shane thanks for putting these video's together

[andrej]

Now I understand why you tested your Migro Aray 2 lower than the other ones in your previous video. Thanks!

[knowyuhgrow]

Thanks for sharing alot of people leave out this information 👍🏿

[meetmeatleicstersquare]

congratulation on 100, 000 subscribers xx

[warrenarbuthnot]

I find your tips and guides very informative, usefull and accurate I have watched a lot and refer my mates keep it up mate

[TriStateTrichomes]

I was just making a similar video. I'm gonna have to do another take and name drop you and this video to help share knowledge. The more you know the more you grow 😆

[koyaanisqatsi]

Everything I'm wondering about you got a video on it; great! I'm looking to overpower my lights just a tad for my size tent so I can have a bit more distance and reach excellent uniform numbers dimmed, and use two instead of one so I get corner to corner coverage as most LEDS do drop off significantly once you're out under the board and large boards usually have a big hot spot in the centre.

[NickFallsFromTheRoof]

This is really good content. Scientific, concise and clear. Love it.

[i.b.l.b]

loving my aray pro, i also have the vipar 1500 in my veg room.

[mrkymrk]

Thanks Shane! Curious, do you agree with ramping up DLI during flowering? As an example, one website recommends a DLI of 25, 28, 30, 35, 40, 45 during the 1st thru 6th week of flowering. Or should I hit the plants with a DLI of 45 starting in the first week?

[djSpinege]

just picked up a Viparspectra P4000 with your discount code. Cheers!

[gedeuchnixan]

What I find kinda funny, all those lights are dimmable and tonns of people are making a huge fuss about that function but yet, I NEVER FREAKIN EVER see that function being used in a test, just hight adjustments! WHY? For the XS1500 e.g. how about 14" hight and dimm it down a bit to get rid of that 1.2K hotspot? For the 3 provided charts 14" looks like the sweetspot, except for that hotspot. Why am I asking? I wouldn´t put more than ONE plant (ya know which one) underneath a single XS1500, 2x2 is just perfect for a single plant using low or very low stress method. Got two DarkDevils in a 80x80cm tent and there´s not enough space for two more and I´m using just low-stress, not very-low or even extrem-low stress like last time. And for my 80x80cm tent, I got four (4) Vipaspectra P600 inside that tiny tent with the lights hanging closer to the walls/corner for more uniform lightoutput. I looked at the single lamps for that tent, but I simply don´t like their lightspreading, at the sides and in the corners the numbers are WAY to low for my taste (350-400mol?), so screw that 100W less powerdraw, when those lamps easily have 200mol less than four P600 in total. If I positioned them correctly, I should have 800-900mol on the entire area.

[josephdowgiallo]

I have been looking at the GLS 850 for purchase and was curious if the light was hung 24" above the canopy if co2 supplementation would be needed or if the light can just be dimmed down? I like the idea of having the higher wattage light for a larger space later. I am currently in an 8 x 8 tent and planned on using two of the GLS 850 for now.

[laurieedeburn]

glad u had a sweet holiday with the family.... your wife is a treasured gal

[markb]

Hi Shane great video, just if someone had four off the older Migro lights in a 1 m X 1m, in theory, make hight would you recommend, as much as I remember you recommend 30cm to 45cm I think, so would you recommend around 52 to 55cm, thanks

[redeye]

you said lots of web sites like yours ..nah you got that little more quality and info then any other migro sets the par ...good stuff