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That Guy
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Registered: 08/12/08
Posts: 4,055
Loc: Southwestern US
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LED's are less efficient than HID's when it comes to light out vs. wattage in.
The difference is that due to the very specific wavelength's of light that can be output from the LED's the actual usable light output of Red/blue LED combos is more efficient per watt in than HID's
out of an HID's total light output, 10 to 15% of that light is usable by the plant, the rest bounces around the grow room until it is absorbed by the mylar or the plant...and converted into heat. A good LED system puts out 75-100% of its light in the usable wavelengths.
In a watt to watt comparison for a decent 600W LED grow light versus a 600W MH/HPS HID setup...I would be willing to bet a decent amount of money that the LED setup would far outperform the HID.
The problem is that this is not how the LED market works. LED "equivalent HID wattage" is used. So for a 600W HID system, most companies would suggest a 120W LED model, which will not measure up to a 600W HID system no matter how badass the LED lights are, I know this from experience.
The biggest reason that LED's are currently sucky is because they are so goddamn expensive for the wattage. If I could buy a 600W LED grow light for the same price as a 1000W HID...I would buy the LED grow light and be done with it. But as where you may run $500 for a nice HID system, a 600W LED system usually costs over $2000, and is not worth that kind of money.
This is my two cents on the matter...I could get into photo-regulated processes within the plant and how most LED's are inferior in that way but I'll just leave that for another post...
peace guys and gals agmotes165
-------------------- “The Universe is under no obligation to make sense to you” -NDT
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That Guy
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Registered: 08/12/08
Posts: 4,055
Loc: Southwestern US
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Re: More talk about LED's [Re: DieselB]
#410367 - 05/02/10 11:34 AM (14 years, 9 months ago) |
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again...this depends on the type of LED used...
LED's come in many different "viewing angles" such as 10o, up to about 120-135o...this is the total angle through which the light is distributed.
If the LED light is made up of wide angle LED's then it will have a much larger footprint. This will also decrease light intensity...which would be perfectly fine for a 600W.
-------------------- “The Universe is under no obligation to make sense to you” -NDT
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That Guy
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Registered: 08/12/08
Posts: 4,055
Loc: Southwestern US
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Quote:
206 said:
Quote:
Harry_Ba11sach said: I'm still not sure I agree. As a case study, compare Agmotes LED grow where he used approx 200W of LED power with my CFL grow where I had 250W of CFLs (although only about 100W was on a single plant).
I yielded nearly triple what he did
No offense to agmotes but cultivation skills and factors alone could explain the difference IMO. My 120w LED vastly outperforms 195w CFL (3x 65w Flourex CFL's) for comparison. Just like the ICmag thread we might be splitting hairs unless people try both and report unbiased results, but the fact that he said it was a fact is what I take offense with. This guy clearly hasn't cultivated anything under LEDs and is spewing hypothetical bullshit based on studies of drop-in T8 tube LED replacements, etc. He says getting two lamps side by side isn't the solution when in fact it is, lol.
I have to agree...I did not have ideal conditions for those grows, the soil mix was ok, the temperatures were always hot and im sure the CO2 concentrations were probably low due to 2 plants in a tiny space. I'm glad my grow is seen as a sort of benchmark but it was by no means perfect.
If nobody else does this then I will have a steady flow of money coming in about a year...and will purchase a 600W LED and a 600W switchable MH/HPS system and do a side by side grow with better conditions.
I just currently don't have the money, time, and space to do it currently or it would already be done.
peace, agmotes165
-------------------- “The Universe is under no obligation to make sense to you” -NDT
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