Will switching from hps to led stress my plants?

hyroot said:

No it won't tress your plants out. When you change a spectrum there is what's known as a spectral transition where in the plant acclimates itself to the new spectrum. Which usually takes about a week.

If your led is too close to the canopy it will stunt and slow growth.. you want them about 18 -24 inches from the canopy. Hitting about 800-1000 ppfd

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Chicsgro2 said:

I'm with you on that. My led was awesome for veg but flowering took longer and yielded less for me. Like you said though, could have simply been the wrong led 'cause my temps still weren't all that low! Had to upgrade my vent system for all light systems.

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ryan1918 said:

Why don't you bring in cold air from outside, or push the heat outside, with the cool air you should be able to run anything as long as you got a decent enough fan to push or pull some air, seems like a major downgrade with LED, I've used led's during flower and there junk compared to what a hps light does, im not saying all the Led's are the same but the one I had sucked for flowering but was good for vegging. I would upgrade the 4inch fan to a 6-8inch you can always turn it down if need be and get a reducer for the size.

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bhoot said:

What stage is your plant in? Try not to disturb plants in their early flowering, you'll lose yield and maybe create hermaphrodites in the process.
Use a narrow spectrum LED, introducing it for 3 days along with HPS (if you can dim them both), then slowly removing the HPS. But any stress is un warranted in the flowering stage, my man.

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kmog33 said:

You obviously had low quality LEDs. Led yields more watt for watt than hps. But only if you are using high efficiency LEDs.

I'm also willing to bet you were comparing an LED that used a quarter or less of the output of whatever hid you were using.

People don't seem to understand that you still have to pull comparable amounts of light to have an accurate comparison of yield. Comparing a 300 watt led(100-120watt actual draw) to a 400, 600, or 1k watt hps doesn't even begin to make a fair assessment of whether one is better than the other.

Comparing 6-10 X 300 watt LED panels to 1 X 1k watt hps would be a more accurate comparison with these Mars and other low quality led panels.

100% led, have 2 plants left to harvest this cycle and an already around 1 gpw.

and if you're worried about size/density.

Sent from my iPhone using Tapatalk

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alaskachic said:

OK now I' m really confused some are saying Led OK for flower. Others swearing no they give no good yields. God now my confidence is shaky for I soon need to flip! Have a 300w going now & Iplan to add another 300w. You guys!

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alaskachic said:

Oh hun I'm no scientist or engineer! Omg too complex for me! This is me go to amazon & click click on the way! Sometimes shipping can take 10 days to get here. Or I pay almost double for grow accessories up here not much selection either. I can get fox f products good $.

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alaskachic said:

Although who doesn't want to grow cup winners every time!

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alaskachic said:

You know it! Thanks for good info hiroot. Who was it that said. "Nessecity is the mother of all inventions". In my case I have managed to keep Me costs under 500 so far that is! If I would stop cruising bean banks maybe I get somewhere! Hee

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comforting to know I have a few saved as well. Its like having a box of See's Candies post: 12385992 said:

Don't even get me started on collecting seeds lmao. I have too many. I like having a a wide variety of genetics though. We don't know what the future holds with these seed companies. It's good have a stocked up supply. .

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