c'mon man,you can veg under any one of these lights
Im deciding whether to use a 250w HPS or 2 250w CFLs for flowering. Im just going to use 1 250w CFL for vegative growth. What Im trying to figure out is if using a 250w HPS would make a significant difference to the quality and yield. Like I said in my first post both setups will come to around 30,000 lumens. Some people are saying the light penetration is stronger when using a HPS but I'm wandering how true that is because alot of it is being based on how much light per sq feet each light can cover. As Iv said though thats sort of irrelevant because you can almost place the light as close as you want using a CFL....What I really need is the science...
Thats cool man, i'm just saying 2,000 lumens per square foot isn't enough for my tastes, and that's initial lumen output, and the 150w degrades quickly.
Well of course if I could cool a 400 watt that is what I would be using for sure..More lumens definately means bigger plants, but by taking 2 250 watt CFL's you aren't adding any more lumens than with 1 250 watt CFL just more coverage..
No, you are still mistaken it's exactly twice the lumens.
Shit yeah, I had in my head that it would cost less using a CFL regardless of watts. I don't know why I didn't think about it. Shit lol. That means Il have to use either just one 250w CFL or one 250w HPS for growth and flowering...or risk it and use the a 400 watt hps. Do you think you could run a 400w HPS with only 1 intake fan?
I think you should really just use a 250 watt HPS because the use of fans and such is gonna add a little bit and just stay safe but thats just me..
I don't want to be combatitive but under that theory one 400w HID would have the same lumens as 4 400w HID?, are you thinking spectrum?
With a 400 watt Hps it would cost £9.30 with electricity being charged at 0.065p pkwh. Add a 100w exhaust fan running 12/12 is an extra £2.30 Then another 100w intake fan running 6/18 is £1.15. So total cost works out at £12.75 a month. My gas company charges 0.065 pkwh every quarter then half that for the rest of the year (Im not 100% if that means if they charge more during one part of the year than the other)So If its being charged at 0.035 pkwh it'l work out at £6.40. I'd be using the 400w for 2 months (flowering period) so it's either going to be roughly £25 or £13. So I dont know with a 250w I know my landlord wouldn't notice the difference (the bill would be over half the price of the 400w) I need some to think
..lol
I think the watt of the light determines the brightness and lumens determine the quality of the ligh being produced. Obviously two lights with 15,000 lumens would give a 30,000 lumen output though lol. If I'm right though the total wattage of a light should determine the area your covering, a 250w HPS might cover you for growing 2-3 smaller plants while a 400w would cover 4-6 plants.
no matter what light system u using u need good ventilation u need good air flow hot air going out and fresh air going in or get a Co2 tank ... no matter what u need good air flow
No you don't if your using CFLs ina small grow space. Just opening the doors and breathing on them is good enough for ventilation and CO2
It is spreading out the light more so yes dont get me wrong more light = bigger plant however yes lumens do not add up..
Read some of this thread https://www.rollitup.org/grow-room-design-setup/82702-lumens-they-dont-add-up.html
