I had a question About the watts. When transitioning to flower do the lights need to be at 600 watts or i can put them down to maintain the temperature. Would the buds flurish with the lights at 400 watts each or some watts 600 and some 400 would it be a problem to mix them. Please help
Watts
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LeastExpectedGrower
Well-Known Member
Think less in watts and more in PPFD/μmol and DLI
Overall wattage used is only a small part of the equation, since you're also dealing with distance of plant to light and also the efficacy of the lights you have. Even if you only have a cell phone, there are apps that can help you get a rough idea of what you're supposed to be giving your plants in different stages...and plenty of charts/graphs online for suggested amounts.
Overall wattage used is only a small part of the equation, since you're also dealing with distance of plant to light and also the efficacy of the lights you have. Even if you only have a cell phone, there are apps that can help you get a rough idea of what you're supposed to be giving your plants in different stages...and plenty of charts/graphs online for suggested amounts.
LeastExpectedGrower
Well-Known Member
I like the Photone online DLI Calculator, because it tells you if you're too much/too little and how to adjust, and it works by weeks.
Photone - Grow Light Meter
growlightmeter.com
Once you get through using the calculator once, it drops you to a page that has this graph, which should also help you.
Some other reading for you.
How Much Daily Light Integral (DLI) Does Cannabis Require?
Several requirements, like the daily light integral (DLI) for example, help cannabis plant growth. Check out this read for extensive details on how lighting can support better harvests.
www.420greenthumb.com
Understanding Grow Light PAR, PPFD, Wattage And DLI (2023)
How much PAR does my marijuana or vegetable plant need to maximize harvest? Find out the minimum PAR value you plants need before you buy a grow light.
420expertguide.com
Flowering Light intensity??
I’m Switched to Flower and my lights have adjustable dim for Veg (blue) and flower (red) I veged them at 100% Veg and 60% flower, what should I change the ratio for the start of flower. I don’t want to blast them full power in the start of flower, I have them 70% Veg and 85% flower. Appreciate...
www.rollitup.org
LeastExpectedGrower
Well-Known Member
Depending on who makes them, the manufacturer may have published maps/numbers. Though often some of the numbers are fluffed since not all manufacturers are all that honest/legit. You can either buy a somewhat cheap but decent light meter or you can find a somewhat accurate light app for your phone. The phone apps can vary depending on smartphone camera hardware though. I use the Photone app on my iPhone XS which by all reports is pretty damn accurate, but not all phones are like that.
Horselover fat
Well-Known Member
This is hps, right?
If your space and temperature allows it stick 600w. If too hot or too much light then you can drop to lower levels. Super lumens just adds a few watts more and shortens bulb life. It's a gimmick imo and I never used it.
Lordhooha
Well-Known Member
Why not just run them all at 600? You'll get better growth and everything. As long as you're able to keep humidity up and temps where they should be you'll be fine. Generally ppfd will increase as wattage increases. With led you're able to get more ppfd at less wattage but you also have to run temps higher and watch your humidity.
My problem is i cant seem to keep the temp down im at roughly 34-35
I had a buddy who keept his at 37-38 and came out with a huge yield but he would give them up to 7 litters of water
Roger A. Shrubber
Well-Known Member
from experience, a 600 watt hps will cover a 3 by 3 area pretty well, 12 of them should cover a 10 x 12 area very well....you could probably cover a 12 x 14 and get pretty good results, just turn the ones on the outside edge a 1/4 turn every couple of days...
So would 18 plant (30lt pots) be okay with 12 lights?
hotrodharley
Well-Known Member
If you know what you are doing you bet.
I have done this more than a few times. Im just using lst training this time thats why im a little worried because im trying something new
Lordhooha
Well-Known Member
I'd like to see what they looked like. Huge yield doesn't mean good. The temp is too high especially without co2. You need at least 24k btu to even try to cool that many lights. You want to be in the 75degree range tbh. Unless you're running co2.
Roger A. Shrubber
Well-Known Member
can you fit them into a 12 foot by 12 foot area? probably, but they might be a little crowded, and remember, the ones on the outer edge are going to need to be turned every couple of days or one side will be under developed, will you be able to get to them, or will they be immobilized in a scrog net? if netted, you might want to go with a slightly smaller footprint area, like 11 x 11, to make sure the ones on the outside get sufficient coverage
I will try to get pics but they were big and good looking nugs. Everyone has their own way that works. It just depends on experience and fails to realise how and where you sent wrong
ttystikk
Well-Known Member
12 x 600W = 7200W, gonna need a lot more than 24k BTu of AC for that.