Testing HLG's far red light

[end_of_the_tunnel]

Yeah, I missed this also. I got some led's from rapid and added about 15w of deep red and 20w of far red to my 3x3 tent. They are on separate drivers and timers. I run different light levels depending on growth stage, but right now I have about 290w of white qb light.

Right now I run the deep red from just before mains on to 30 mins before mains off. I turn on the far reds 5 minutes before mains off and keep them on for 30 minutes after.

I was doing this through veg and just switched to flower. It was like a starting gun went off. Plants are up probably 8 inches in 3 days. Of course, I also added co2 and raised the temps and humidity in the tent to vpd levels so it's hard to tell what did what. Oh, and this is a sativa dominant strain whereas I usually run indica's.

So far the plants are loving the combination, but it looks like I should maybe cut back on the far red time some?

I miss randomblame. Sadly his posts which were of immense utility to a forum like this are difficult to search. He could have offered qualified advice here. My gut tells me you got way too much far red. You are growing sativa, how long have they vegged, current height and how much headroom do you have left in your tent? What Kelvin are your white lights?

The far red thread

Thought it might be fruitful to have a far red thread. There are a couple uses for supplementing far red I've found so far. The Emerson Effect states that a combination of 640-680 and 735nm light will produce more vegetative growth than an equal amount of 680 alone or 735 alone. Has anyone...

www.rollitup.org

Search for "2000", in that thread.
Use the basic formulae randomblame posted there to calculate adequate far red levels, based on the specific far red leds you bought from Rapidled. If you not sure on the specs, the vendor should be able to help. I do not see anyone on this forum giving you accurate advice without walking through the maths.

 

[greg nr]

I miss randomblame. Sadly his posts which were of immense utility to a forum like this are difficult to search. He could have offered qualified advice here. My gut tells me you got way too much far red. You are growing sativa, how long have they vegged, current height and how much headroom do you have left in your tent? What Kelvin are your white lights?

The far red thread

Thought it might be fruitful to have a far red thread. There are a couple uses for supplementing far red I've found so far. The Emerson Effect states that a combination of 640-680 and 735nm light will produce more vegetative growth than an equal amount of 680 alone or 735 alone. Has anyone...

www.rollitup.org

Search for "2000", in that thread.
Use the basic formulae randomblame posted there to calculate adequate far red levels, based on the specific far red leds you bought from Rapidled. If you not sure on the specs, the vendor should be able to help. I do not see anyone on this forum giving you accurate advice without walking through the maths.

Thanks, I'll look it up.

I knew there would be stretch so I put a scrog net as close to the soil as the plant would let me. I then trained it to fill the holes but didn't let it go vertical. Maybe 6-8 inches. Total veg was a little over 3 weeks. The lights are about 6 feet up. Plants are about halfway.

Lights are 3k 288s, v1. I also added some 5k and 6.5k LEDs to supplement.

Nothing to do but wait and supercrop.

 

[kratosxxl]

The rate of stretch on these plants is scaring me. At this rate, they will be in the attic by week 4, and my grow is in the basement. Although the nodes are still tight.

I made a mistake in the last post, my far reds were only on for 15 minutes after lights out. I dropped that back to 7 today. All they are doing is putting them to sleep. I'm not trying for an Emerson effect.

I may have to do an aggressive leaf strip at the end of week one to try to slow them up a bit.

Sheesh, first world problems.

were u running along with ur lights ? or just 15 min before and after ?

 

[greg nr]

The deep red run until 30 minutes before lights out. The far reds just at lights out. I reduced it to 7 minutes until I crunch the numbers.

 

[Airwalker16]

The deep red run until 30 minutes before lights out. The far reds just at lights out. I reduced it to 7 minutes until I crunch the numbers.

I have used 15 mins on after lights out for years now and I've never had a problem.

 

[Airwalker16]

were u running along with ur lights ? or just 15 min before and after ?

660nm is the WAKE UP WAVELENGTH. NOT 730NM FAR RED. You are wasting your time Tue I g these on 15min before lights turn on. If anything, you're further confusing them.
There is MORE than enough 660nm in your average 3000K setup to get your girls up and at em.

 

[greg nr]

660nm is the WAKE UP WAVELENGTH. NOT 730NM FAR RED. You are wasting your time Tue I g these on 15min before lights turn on. If anything, you're further confusing them.
There is MORE than enough 660nm in your average 3000K setup to get your girls up and at em.

I don't run the 730's at lights on. Only at lights off. The 650's come on in the morning and turn off before lights out. It isn't a lot of light regardless; only 15 watts.

It's the 730's that i reduced to 7 minutes at lights out. They aren't on during the day.

 

[kratosxxl]

660nm is the WAKE UP WAVELENGTH. NOT 730NM FAR RED. You are wasting your time Tue I g these on 15min before lights turn on. If anything, you're further confusing them.
There is MORE than enough 660nm in your average 3000K setup to get your girls up and at em.

So far red (720) is ok/beneficial to run along with main lights ?
i contacted rapid led they recomended to run along

 

[Airwalker16]

So far red (720) is ok/beneficial to run along with main lights ?
i contacted rapid led they recomended to run along

I don't see any point running our on average, 17watts of far red per 4x4 the whole day. You wouldn't even be able to tell its there on a spectral graph.

 

[kratosxxl]

I don't see any point running our on average, 17watts of far red per 4x4 the whole day. You wouldn't even be able to tell its there on a spectral graph.

Ur right those are pretty dim, i have 2 for 4x8 , add more maybe ? I can use some stretching for 4 plants they shorter then the rest

 

[greg nr]

Fwiw, I'm not using the rapid puck. I bought 6 of the cree far red chips and a driver. The far reds are pulling about 20 watts at the wall.

Not a huge difference, but it's only a 3x3.

 

[kratosxxl]

Fwiw, I'm not using the rapid puck. I bought 6 of the cree far red chips and a driver. The far reds are pulling about 20 watts at the wall.

Not a huge difference, but it's only a 3x3.

Mine has 4 cree chip on each puck but mnfct sayd its 3x3 coverage but not sure at what height

 

[Airwalker16]

Mine has 4 cree chip on each puck but mnfct sayd its 3x3 coverage but not sure at what height

Yours are made by who?

 

[kratosxxl]

Yours are made by who?

RapidLed

Far Red Initiator Puck

.

www.rapidled.com

 

[greg nr]

RapidLed

Far Red Initiator Puck

.

www.rapidled.com

The rapid puck was designed by @Growmau5. He has a lot on youtube about it. It was ,meant to work with the chilled lights that didn't yet have far red.

If you want to know where he came up with the wattage and 15 minute run time for a 3x3, try reaching out to him. He used to be around. Not so much these days. But I'm sure he's lurking.

I love his saying: "630 in the morning, 730 at night, your plants will do all right...." lol

 

[Airwalker16]

The rapid puck was designed by @Growmau5. He has a lot on youtube about it. It was ,meant to work with the chilled lights that didn't yet have far red.

If you want to know where he came up with the wattage and 15 minute run time for a 3x3, try reaching out to him. He used to be around. Not so much these days. But I'm sure he's lurking.

I love his saying: "630 in the morning, 730 at night, your plants will do all right...." lol

I know all about that dude. He's very intelligent. Never comes here anymore tho.

 

[kratosxxl]

The rapid puck was designed by @Growmau5. He has a lot on youtube about it. It was ,meant to work with the chilled lights that didn't yet have far red.

If you want to know where he came up with the wattage and 15 minute run time for a 3x3, try reaching out to him. He used to be around. Not so much these days. But I'm sure he's lurking.

I love his saying: "630 in the morning, 730 at night, your plants will do all right...." lol

well i use FR at the end for 15 min after lights out , i also wana try to keep one of them along with lights to see if it will really make stems longer