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One thing you will find out there will be 12 different ways to accomplish the same thing ,go with what sounds right to you .Most people here will not say your doing something wrong or dont do that, I like to say in my grows i did this or that , We love newbs read as many of the tutorials you can in fact there is a shopping list to set up with

COB lights(Chip on Board) offer better efficacy than the older tech diodes as well as focused intensity for good penetration but because the light is focused they lack good coverage. 16 sq. feet would require 8 to adequately cover the area in flower.

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new grow room built summer of 2017 ,argo max tent for veging ,big kahuna reflector, 1000hps with added leds for the full spectrum . 15th indoor grow ,5 years outside gorilla grows(stealth is the key),veg under t5s growing autos under 300w leds
current grow https://forum.growweedeasy.com/forum. -new-grow-room

The Viparspectra is a nice enough light but it still uses the older Epiled/Bridgelux diodes and the truth is they just aren’t as efficient as an LED should be. The MarsHydro light looks to be using a Quantum board design but they don’t say what chips they are using so it’s probably a knockoff of the Samsung LM301B. If they were using the real thing they would let everyone know it.

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Those are both nice lights for sure but I don’t feel like either one will actually give you great performance flowering a full 4×4. I think they would fit a 32"x32" great and be adequate for a 36"x36" but if you actually want to have enough light to flower a full 4’x4′ tent you’re going to want something with a bigger footprint or use multiples like maybe a pair of MarsHydro TSL2000s or SP250s. It’s not much more money but you’d get a way better spread., the ability to only use one when you only need to light a smaller area (I know the VS1350 is dimmable) and if you have a warranty issue with a light, you’ll have another one already to at least have enough light to keep plants healthy and growing while waiting for the other one. If you could deal with a tiny bit more heat, you could go 600w MH/HPS and a Daisy reflector for half of what you were going to spend on an LED.