cxb3950 vs hps

ttystikk · Dec 6, 2016

Stephenj37826 said:
HID follows this basic rule. If you pump 1000 watts into an HID bulb 1000 watts of energy is coming out. In SE HPS case around 32-33% comes out as visible light or PAR(Photosynthetic Active Radiation) light. The rest comes out above 800 nm which isn't depicted in the spectrum graph on the box. This 800+nm "light" is actually infrared heat(same as comes out of most small electric radiant heaters). Led on the other hand is different. If you put 50 watts into a COB you get 25 watts of usable light and 25 watts of heat (just an example). The difference is the type of heat. The LED's waste heat is expelled off the back of the led into the heat sink where it is dissipated into the air. It doesn't have the heat soaking effect that HID has. So basically it's Radiant heat vs Compounding Conductive Heat.

And yet the modules I've already converted to run warm still radiate heat- and the plants respond differently as well. They look a bit more like they were grown under HID.

giantsfan24 · Dec 6, 2016

Stephenj37826 said:
HID follows this basic rule. If you pump 1000 watts into an HID bulb 1000 watts of energy is coming out. In SE HPS case around 32-33% comes out as visible light or PAR(Photosynthetic Active Radiation) light. The rest comes out above 800 nm which isn't depicted in the spectrum graph on the box. This 800+nm "light" is actually infrared heat(same as comes out of most small electric radiant heaters). Led on the other hand is different. If you put 50 watts into a COB you get 25 watts of usable light and 25 watts of heat (just an example). The difference is the type of heat. The LED's waste heat is expelled off the back of the led into the heat sink where it is dissipated into the air. It doesn't have the heat soaking effect that HID has. So basically it's Radiant heat vs Compounding Conductive Heat.

Thank you for that info. It provides considerations that I didn't know previously.

Gerber101 · Dec 6, 2016

What room temps are you guys trying to maintain with all LED light? I've heard around 85F

What humidity with all LED, any different than with HPS?

Also are most people trying to blow the hot heat sink air down towards the canopy?

Yodaweed · Dec 6, 2016

Stephenj37826 said:
HID follows this basic rule. If you pump 1000 watts into an HID bulb 1000 watts of energy is coming out. In SE HPS case around 32-33% comes out as visible light or PAR(Photosynthetic Active Radiation) light. The rest comes out above 800 nm which isn't depicted in the spectrum graph on the box. This 800+nm "light" is actually infrared heat(same as comes out of most small electric radiant heaters). Led on the other hand is different. If you put 50 watts into a COB you get 25 watts of usable light and 25 watts of heat (just an example). The difference is the type of heat. The LED's waste heat is expelled off the back of the led into the heat sink where it is dissipated into the air. It doesn't have the heat soaking effect that HID has. So basically it's Radiant heat vs Compounding Conductive Heat.

Well stated, both cause heat just dissipate it in a different fashion

MeGaKiLlErMaN · Dec 6, 2016

Yeah you want to keep them separated, I'm running the same kind of test. But also with DE, they are much bigger now.. Also I added mammoth P and noticed a difference in one day..

Stephenj37826 · Dec 6, 2016

MeGaKiLlErMaN said:
Yeah you want to keep them separated, I'm running the same kind of test. But also with DE, they are much bigger now.. Also I added mammoth P and noticed a difference in one day..View attachment 3847301 View attachment 3847303 View attachment 3847304

I hear good things about that mammoth p from lots of people I trust. Glad to see it's working for you.

MeGaKiLlErMaN · Dec 6, 2016

Stephenj37826 said:
I hear good things about that mammoth p from lots of people I trust. Glad to see it's working for you.

I gave it a full light period:. Literally twice as much growth. Compared to without it

Jp.the.pope · Dec 6, 2016

MeGaKiLlErMaN said:
I gave it a full light period:. Literally twice as much growth. Compared to without it

As in a full light cycle/day?

MeGaKiLlErMaN · Dec 6, 2016

Jp.the.pope said:
As in a full light cycle/day?

Yes 18 hours with P had twice as much growth as a day without it.

Abiqua · Dec 6, 2016

An understanding of the scientific method and eliminating variables. Thats its, that is what a controlled study does....@bri77 otherwise I agree. "Scientists" are regular fucktards too :peace:

Stephenj37826 · Dec 6, 2016

Gerber101 said:
What room temps are you guys trying to maintain with all LED light? I've heard around 85F

What humidity with all LED, any different than with HPS?

Also are most people trying to blow the hot heat sink air down towards the canopy?

I like to shoot for 82-83 without supplemental CO2

MeGaKiLlErMaN · Dec 6, 2016

Stephenj37826 said:
I like to shoot for 82-83 without supplemental CO2

Thats a safe zone, Im always sitting at 84-86F with the lights on. Perfect temp as Im sure you know it is also the plants metabolism the hotter it its(up to 86F without CO2) the faster your plants work/grow. Past 86F you need CO2 or your growth wont be at the optimal level and suffer. 75F at 1000PPFD grows at the same rate as 500PPFD at 86F

a mongo frog · Dec 6, 2016

MeGaKiLlErMaN said:
Yeah you want to keep them separated, I'm running the same kind of test. But also with DE, they are much bigger now.. Also I added mammoth P and noticed a difference in one day..View attachment 3847301 View attachment 3847303 View attachment 3847304

Is this the test run everyone is waiting for?

SimonBarSinister · Dec 6, 2016

BecauseIgotHigh said:
Try doing separate grows COBS VS HPS, without any of the light interrupting each other. 600W COBS matching 600W hps.

Yeah that was the idea but i gotta come up w/ $ for another rack of 4 cobs!

ttystikk · Dec 6, 2016

Gerber101 said:
What room temps are you guys trying to maintain with all LED light? I've heard around 85F

What humidity with all LED, any different than with HPS?

Also are most people trying to blow the hot heat sink air down towards the canopy?

I'm running mid to upper 70s and I'm pretty happy with how things are looking so far.

ttystikk · Dec 6, 2016

MeGaKiLlErMaN said:
Thats a safe zone, Im always sitting at 84-86F with the lights on. Perfect temp as Im sure you know it is also the plants metabolism the hotter it its(up to 86F without CO2) the faster your plants work/grow. Past 86F you need CO2 or your growth wont be at the optimal level and suffer. 75F at 1000PPFD grows at the same rate as 500PPFD at 86F

Yes, BUT:

We aren't growing vegetable matter, but rather resin. My resin production drops above 80. I do use co2.

SimonBarSinister · Dec 6, 2016

bri77 said:
Its just one reason informal "grow-offs" are not really valid ways to compare radically different lights. Do you keep both sides exactly the same, temps , canopy shape etc, and therefore favor one fixture over the other?

Constructing a valid grow off is a job for a trained scientist imo.

I agree. already have a full-time job and I don't have near the time or equipment to do a valid comparison.

MeGaKiLlErMaN · Dec 6, 2016

a mongo frog said:
Is this the test run everyone is waiting for?

Im not sure about that, but it is all the same exact nutes, same environment, and same amount of time... so I mean Ive not heard it hyped... If its a joke about the size of the plants, that was taken the day I put the clones into the system. They are doing quite well and have had explosive growth in the last 2 days.

MeGaKiLlErMaN · Dec 6, 2016

ttystikk said:
Yes, BUT:

We aren't growing vegetable matter, but rather resin. My resin production drops above 80. I do use co2.

Correct, But Im aiming for growth in Veg and not many people talk about it. Ill drop the temp once I move to flower. what would you estimate the best temp for flower would be? Ive always thought 78F was a sweet spot.

SimonBarSinister · Dec 6, 2016

BUENO !!

cxb3950 vs hps

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