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Viparspectra P2000 and distance between LED and plants Tops

Hi,

Do you you think 25cm to 30cm between lamp and plant tops in flowering would still do it for 3'x2' tent in term of light dispersion on the greatest width of the tent and heat under the lamp when viparspectra recommand 51cm in flowering for a 4'x2' tent ?

As comparison:

viparspectra P2000 - 200W - they recommend 51cm from plant tops in flowering
marshydro TSL2000 - 300W - they recommend 30cm from plant tops in flowering

(but mars hydro TSL2000 is 101cm width and my tent is only 90cm width)

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Replies (11)
    • if you have a phone there is an app that a few of us use on here use that can give you a fairly accurate reading for your lights. PPFD and DLI meter is handy to get it dialed in, once you get a feel for the output you can check yourself with your meter app when adjusting the lights.

       

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      • Look at the ppfd map for the light, I wouldnt accept any thing less than 500 ppfd in the corners of the tent and an old school rule of thumb was 35 watts per Sq Ft minimum. Personally I think 40 watts is closer to the min and 200w/6sqft 33w per sq. ft so that light would be under powered fir me. Search the old messages, RbtAsq has a good light with great PPFD coverage for a 2 X 4 area but I am not sure if that would over kill for a 2 X 3 area.  

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        • I agree with CPW. (his numbers) That light also would be underpowered for me as well.

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          • Agreed with under powered, you have to calculate the true wattage that is the actual watts it's drawing from the wall I like around 50 watts per sq ft but if I could I would go to 60.

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            • I will endorse that

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              •  While researching for new lights, I read that good LEDs replace HPS at 60%.

                Rule of thumb for HPS was always 60 watts/ sq ft. 60% of that would be 36 watts. Push it to 40 or so, but 55 puts you in HPS territory!

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                • Anyway finnally changed my mind to help with summer heat stress as i don't have that much money to invest actually.

                  i decided to keep my HPS 250W and invested in:
                  - Reflector XTRA-COOL V2 125MM glass ventilated type cooltube
                  - PLATINIUM Nutrients - Box of 60 CO2 TABS tablets

                  from my research around the net the cooltubed reflector may help reduce heat from 3°C to 7°C and CO2 tabs with each watering should help the plant handle more heat.
                  (Another benefit of a CO₂-rich grow op is that cannabis plants can tolerate slightly hotter temps. Instead of religious dedication to ensuring temps never exceed 28°C with the right CO₂ ppm marijuana can still thrive in the 28-33°C temperature range. In fact, weed prefers slightly higher temps in a CO₂ rich environment.
                  (source: https://www.zamnesia.com/uk/grow-weed/398-effects-of-co2-on-cannabis-plants ))

                  Also someone hilighted me that viparspectra P2000 had less red in her spectrum than some other brand, and so on might be more optimum for vegetation than flowering.

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                • Vince welcome to weedportal!! 

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                  • You're gonna love the Cooltubes. A lot of us used them for HIDs, before we switched to LEDs.

                    My wife wants me to sell mine (2@1000 watts), but I'm not gonna.  lol  I'm emotionally attached to them, we grew some great weed together.

                    Hook a good 6 inch fan, to the input side of the light, and you'll be able to touch the glass while they're on.

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