Well everyone is obsessed with GPW as they are with Lumens.
We beat the 1 GPW all the time but this is not a fair measureing system to use with all the varied lighting systems around at the moment.
We feel this should shift more to GPSQM - GPW, meaning Grammes per Square Meter or Grammes Per Week.
This also makes for a fairer representation of yield for different strains that have different growth periods to be measured.
Power to the People
I am pretty sure the only way one could acquire 2G a watt from LED's would be if they use a light mover bar and did a fast double harvest / harvest the top buds lower the lights and mature the bottom scrag.
I have Just bought my first LED lights and am currently starting a 5 plant grow in a 2x4x6 plywood grow box. pics to come at some point after the cute seedling stage.
Back to the main question of what HID and LED growers are getting in yield... Here are my results from all my grows.
The grows were all in the exact same growtent (a 2x4 hydrohut silver that measures 2.5'x5'x7'). Each grow featured 6 plants of various strains so a direct comparison is not really accurate, but more of a "trend" is visible with HID vs LED. Between each grow the soil has had minor changes as well as nutrients so again, this can not be used as a "scientific" comparison, however I do notice a trend of a equal or higher Gram/watt with LED vs HID...however yields are slightly lower under LED vs HID... if given equal draw wattage I think LED would have the edge...
Here are my results.
Grow 1: 1000w HID (400w CMH + 600w HPS) Total yield 574g or .57 grams/watt
Grow 2: 1000w HID (400w CMH + 600w HPS) Total yield 547g or .55 grams/watt
Grow 3: 1000w HID (400w CMH + 600w HPS) No Yield Data (Powder Mildew took over)
Grow 4: 1000w HID (400w CMH + 600w HPS) Total yield 325g or .33 grams/watt
Grow 5: 580w (400w CMH + Mars II 400w) Total yield 245g or .42 grams/watt
Grow 6: 540w HID (3x Mars II 400w models) Total yield 308g or .57 grams/watt
Grow 7: Under 300w (2x Intelligent Gro, GEN1, 180w each on dimmer) Total yield 191g or .63 grams/watt
Grow 8: 3x Intelligent Gro, GEN2, 180w draw each, Total yield 367g or .70 grams/watt
Now like I mentioned, even though grown under similar conditions, there were too many variables that changed between grows to confirm this more than just a reference set of data.
.........Icemud's Grow Journals.........
- 3x Advanced LED XTE 300's, Blue Dream, Black Cherry Cola (Current)
- Advanced LED: XTE 300's and EX-VEG 200's (Complete)
- Intelligent Gro 2: LED grow, V-Scrog, Goin for 1 LB or more!l(Complete)
- Intelligent Gro Gen 1 LED Test Grow(Complete)
- Icemud goes LED featuring Top LED GROW LIGHTS(Complete)
Advanced LED WEBSITE <<--Click HERE
Advanced LED Discount Code "DSXTEADV1"
I like the trend I see in your statistics , Nice to see the positive direction in the results.
the last LED grow harvest was using about 50% less wattage with a 25% higher gr to watt ratio.
Good Job Icemud.
my gpw went from circa 56 with HPS to circa 85 with LED - there is no question that LED can now exceed HID in this metric imo
nice; two Spider Cobs?
No , Some plain 144 x3w panels , black in color , oddly made or marketed by UFO.
I won them on a auction 2 for $170 ( what a deal) I had bought a MarsHydro 300w old style panel a few weeks earlier , its on the seedlings now , it will be used for the "grow" light , the two larger LED's will be put to service in the 2x4x6 plywood cabinet for flowering while the first grow led starts a new batch.
Two months between harvest's , my afghan #1 are 7-8 week plants (likely 8)
The 2 lights are in route