Yodaweed
Well-Known Member
You would get one fixture for 1500$ that can compare to a single gavita 600/750, go with the gavitas they will crush the LEDs.
Which is the best HPS DE combo?
- Thread starter Sam&Max
- Start date
fn217
Active Member
Quantum board based HLG550 for $1K. Pumping out 1400ppfd. Mounted at the right distance, it will be blasting out the same photo level as a Gavita.
CREE's study compared a discrete diode based LED fixture with a Gavita in an integrated sphere. The CREE fixture crushed it with half the wattage of the Gavita.
http://www.cree.com/led-components/media/documents/HorticultureReferenceDesign.pdf
CREE's study compared a discrete diode based LED fixture with a Gavita in an integrated sphere. The CREE fixture crushed it with half the wattage of the Gavita.
http://www.cree.com/led-components/media/documents/HorticultureReferenceDesign.pdf
ruwtz
Well-Known Member
I run x4 Gavita 750 DE's in square formation over a 10x12ft scrog area in a sealed CO2 room. Ceilings are 10ft on the highest side of a single slope roof and lamps are fixed at around 8ft (no need to move up and down). In this formation the crossover of light footprint is maximized; DE is very good at this and I get solid coverage.
These lights are beast mode but do make sure you have cooling capacity (I run 24k BTU mini split) and don't skip on the controller: features such as sunset/sunrise will minimize humidity spikes at lights-off and emergency shutoff is essential should your cooling fail. Lamps are networked into a dimmable group and it couldn't be easier to power up/down as you see fit (lamps can be powered up to 825W each, if i remember correctly).
I veg to 3.5/4ft and with table height gives me a perfect 3ft between lamp and canopy. Canopy temps stable at 80F (+/- 2F). I couldn't be happier with these lamps and have knocked out 2lb+ a light fairly consistently.
These are powerful lights so be sure to feed accordingly; you're only as good as your single limiting factor.
And wear sunglasses!
These lights are beast mode but do make sure you have cooling capacity (I run 24k BTU mini split) and don't skip on the controller: features such as sunset/sunrise will minimize humidity spikes at lights-off and emergency shutoff is essential should your cooling fail. Lamps are networked into a dimmable group and it couldn't be easier to power up/down as you see fit (lamps can be powered up to 825W each, if i remember correctly).
I veg to 3.5/4ft and with table height gives me a perfect 3ft between lamp and canopy. Canopy temps stable at 80F (+/- 2F). I couldn't be happier with these lamps and have knocked out 2lb+ a light fairly consistently.
These are powerful lights so be sure to feed accordingly; you're only as good as your single limiting factor.
And wear sunglasses!
bottletoke
Well-Known Member
De lamps are designed to be used at various wattages, if they fail return them....theyre good for a year. I run my 18 1000w gavitas at various wattages and run them at 115% for 7 weeks in flowering and never had one fail. I change my reflectors and lamps annualy just to maintain par levels.....but what the hell do i know? only have been running 12 for over 3 years and another 6 for 2.
kingtitan
Well-Known Member
Didn't say bulbs fail, I was saying it shifts the spectral output. Your DE specifically says and has info on its output when dimmed at 50/75/100/110+%?
Maybe DE are different and are able to somehow not shift but with standard SE bulbs it does do it and when you shell out the extra cash for the tuned spectrum of higher end bulbs like Hortilux and then modify the wattage, you may as well have bought several cheap bulbs.
bottletoke
Well-Known Member
U cannot compare se's with de's, the overall par is pretty linear to the wattage. a spectrum change happens when dimming less then 85^ which is what u want and exactly what its designed for. Veg with lower watts and benefit with the increase in blue and shift to orange as your power increases towards flower.
zep_lover
Well-Known Member
if you build your own led it is not that big of price difference.the energy savings in controling enviroment is nice.you still need to run at least 75% of the power you would use with the de.it is more efficient so you end up with more light for similar watts.check out the led threads on here.i am no expert but have been running cxb3590 led lights for over a year now.either way you light the plants,if you have a dehumidifier in the grow room,when the humidity spikes at lights out,the dehumidifier helps keep your temps warm.i exchange air between my veg and flower room.i have a mini split in flower room and and the dehumidifier also.
i have my co2 generator in the veg room.i have 2 6 inch vortex fans one going from each room into the other exchanging air constantly.the mini split is set to cool only and my low temp is 68 .have the mini split set at 77 .my thermometer says low of 68 high of 73 and it is in the intake from flower room to veg room.i only run 1 200 watt led light in veg for 6 plants.my mini split is a 18k unit.i live in michigan so it gets pretty cold in the winter.
bottletoke
Well-Known Member
I was looking into exchanging my de's with cobs and the price difference for equal par levels and penetration was almost 300% more for cobs and the heat they produce wasnt that much less then what a de pumps out. i would base ur decision on what your plant height would be, my plants range from 6' to 7', i overcrowd my grow rooms and i still get colas on the bottom of my plants. u have the ceiling height for 1000's and just having the gavita el2 controller should be the decision maker alone.....its the greatest thing about running gavitas!
a mongo frog
Well-Known Member
What kind of trade are you talking about? What DE's you have?
Sam&Max
Active Member
The report states amazing results
That fixture you build it yourself or you buy it?
Sam&Max
Active Member
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bottletoke
Well-Known Member
trade?
a mongo frog
Well-Known Member
Sorry I read your post wrong. At first I thought you said you were looking to trade DE's for cobs. Then i re read your post.
Sam&Max
Active Member
You think I should go with 1000W gavitas and keep the ceiling height of 11.5 foot?
Why?
bottletoke
Well-Known Member
The one thing that holds people back on buying 1000w de's is that they dont have the ceiling height to run them then they buy 750's and convince themselves that theyre better off...dont be that guy.
if u dont know why then u havent done ur homework, if u did u wouldnt be asking.
i veg to 4 to 5' then harvest 6 to 7' plants. 6 1000w gavitas give me a yield of 14 to 16lbs strain dependant. i have some pics floating around here if u wanna take a look.
im bottle.toke on ig, starting to post more over their these days ever since riu had that outage....its not the same like it was.
jonsnow399
Well-Known Member
i just got a 750, I'm one of those guys who thought a 1000 would be too much, based on reading posts. I don't really notice a much of a difference in heat over se.
fn217
Active Member
Do you have any data for this? I've read tons of conflicting info on the internet, with no one posting real data/proof of wattage dimming contributing to spectral shift, or not.
Sam&Max
Active Member
ahhh I don't know... My ceiling height is 11.5 foot. and my setup is three 4x4 tables in a row. My room size is 15x7.5.
If I use 1000 Watt Gavitas, I would hang them higher and at the same time I would get much more wall losses???
Also I heard that the 750 Watts have better spectrum (not 100% sure about that) and operate more efficiently. So if you have the same amount of 750s in Watt as you have with 1000s, you would yield more with the 750 Gavitas.
Also I was sometimes under the impression people use too much watts.
Also I would be able to run the Gavitas at 815 Watts, which gets close to 1000W.
How many 1000s gavitas would you recommend for a space for 15x7.5?
bottletoke
Well-Known Member
u should educate yourself on gavitas. u hang them close to the walls so you get relective overlap, thats how gavita designs grow rooms for there customers, the magic in de's is all about overlap and having even pars throughout the room....sorry, im done, email them yourself and dont base your decision on what you get from forums. there are more idiots on these boards then people that actualy know what they are talking about. sounds like u already listened to them and you already have your mind made up. im not a salesman so i dont benefit in anyway on convincing u to buy 1000's but having the ceiling height to be able to run them and choosing something with less penetrative pars is something i cant wrap my head around. i grow for high quality yield, if 750's where able to do more then a 1000 then i would have them and everybody would have them. 750's are only there for people that dont have the ceiling height to run 1000's, anybody telling you different is in denial.
jonsnow399
Well-Known Member
It does contribute but not much at least according to gavita reps the 6/750. Like bottletoke says they shift toward the blue