Thank you kindly for the Reps Radogast!
I was contemplating with Lady GT the other day about the future direction of our grow here, whether or not to use T5's for veg or LED's.
What i'm finding using this 4ft 4-bulb 220w T5HO fixture from Prolight, is i can stuff a hell of a lot of plants underneath it.. lower the fixture right over top of the canopy and still get approximately 3'x4.5' coverage. I doubt i could get the same coverage with a 300w LED as close to my canopy as this thing is.
The thing is, in order of me to get an adequate amount of LED's in the veg area to get a decent amount of vegetative growth (cause i find it rather slow to be honest) I would need to spend quite a few hundred dollars on LED panels (decent ones that is!)
I'd say 900w or more is the ideal amount of wattage for veg when using LED's.
For flower, i would suggest somewhere in the range of 1400-2000w of LED watts to pull in a noteworthy harvest.
Using that much LED power, you would definitely be able to match a 600w HPS yield WITH ONE PLANT!!
But you would also be putting out as much heat as that same light with that much LED power going on.. Remember, they might produce less heat, but the heat just goes into the room, raising room temps, whereas air cooled hoods and CoolTubes vent 90% of the heat out of the room.
The thing i'm seeing with LED grows, is theres never only one plant under the LED's. theres always multiple, and multiple are needed in order to get more than a couple zips from your harvest.
I'm doing a side by side grow with Cannabis 1 starting in about a month, and he is going to veg his THC bombs under a MARS II 1200w, whereas i am going to veg my THC Bombs under the T5 and my 165w LED for side lighting, then the 600w and the LED for a couple weeks before putting it into flower (Thats only if the LED tent turns out to be male. If not, the LED will still be in use). We both will be flowering our plants under the same amount of light, 2x 600w HPS. I'm interested to see the difference in vegetative growth under the T5's compared to the MARS II
Are you sure you will be running the same amount of watts?
I'd be very surprised if the MarsII draws an actual 1200 watts.