DIYers try to recreate CREE vs Gravita?

a mongo frog

a mongo frog

Well-Known Member
CobKits said:
unless you have a warehouse with high ceilings and a ton of lights gavita reflector aint all that. the Boss/ACDE from sunlight supply puts down a much more uniform par footprint and is usable at 30" (and even better than gavita at 36" as well)

http://growershouse.com/images/DE_TEST_INFOGRAPHIC.pdf
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I cant believe you guys think the DE philips green power bulb is a piece of shit. You guys keep talking about Gavita. Are you guys talking about their ballast, their reflector, the bulb that comes with it?
 
MeGaKiLlErMaN

MeGaKiLlErMaN

Well-Known Member
a mongo frog said:
I cant believe you guys think the DE philips green power bulb is a piece of shit. You guys keep talking about Gavita. Are you guys talking about their ballast, their reflector, the bulb that comes with it?
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Its not shit talking, its messing around. Its a good light with a good marketing team. But to say its the best or that it puts out 2100 umols to the plant just isnt true.
 
a mongo frog

a mongo frog

Well-Known Member
MeGaKiLlErMaN said:
Its not shit talking, its messing around. Its a good light with a good marketing team. But to say its the best or that it puts out 2100 umols to the plant just isnt true.
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Here is mine. Clearly states it. And the current plants at day 19 under it. You don't think those plants are being hit with 2100 umols? I know you guys are sick growers and know your shit, but these Phillips bulbs have to be the best lights on the market by leaps and bounds.
 

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MeGaKiLlErMaN

MeGaKiLlErMaN

Well-Known Member
a mongo frog said:
Here is mine. Clearly states it. And the current plants at day 19 under it. You don't think those plants are being hit with 2100 umols? I know you guys are sick growers and know your shit, but these Phillips bulbs have to be the best lights on the market by leaps and bounds.
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its putting out 2100 umols, but your plant only gets 1700 after reflector losses, then theres the loss from having to be far away... so over all that number drops fast.
 
wietefras

wietefras

Well-Known Member
@CobKits , Could be that the beam angle is the issue yes. The flat plane integration for the Gavita came out at 1814 umol/s while the sphere only measured 1751umol/s. HPS fixtures would show up to 9% more light in flat plane integration compared to the sphere. While led fixtures typically scored higher in an integrating sphere and lower in flat plane integration. Up to 10% higher.
 
wietefras

wietefras

Well-Known Member
MeGaKiLlErMaN said:
Its not shit talking, its messing around. Its a good light with a good marketing team. But to say its the best or that it puts out 2100 umols to the plant just isnt true.
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The bulb has a sticker on it that it produces 2100umol/s. Which is correct. Initially.

Gavita says the following about the light produced:
Roughly these are a few examples of recommendations for a high light recipe of around 700 µmol m-2s-1. Calculations made with 10% reflector / wall losses:

400W a) - 1 x 1 m - 1 m2 at a ppfd of ~ 650 µmol m-2 s-1
600W b) - 1,2 x 1,2 m - 1,44 m2 at a ppfd of ~ 690 µmol m-2 s-1
1000W c) - 1,5 x 1,5 m - 2,25 m2 at a ppfd of ~800 µmol m-2 s-1

In practice levels can be lower with different reflectors (open reflectors will have more stray light), older reflectors and a lot of wall influences. Other lamps may result in different densities.
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800umol/m/s over 2,25m2 = 1800umol/s. 10% reflector/wall losses is a bit on the low side for a single fixture in a 5'x5' tent (or even worse, a 4x4 room wit white walls), but that's also not what these things are actually designed for. So 1800umol/s is a pretty decent estimate for their intended use.

In the product info for the Gavita Pro 1000W fixture they say "Lights more than 2 square meters with 1000 μmol m-2 s-1" (which would be correct for the 1150W setting).
 
MeGaKiLlErMaN

MeGaKiLlErMaN

Well-Known Member
VegasWinner said:
Have you seen this cree board that emulates the standard grow light spect4rum they speak of? It is a 60w 4-channel made to plug into more to get to whatever wattage you are seeking, for a 1000w 16 boards
https://www.kiwilighting.com/cree-xpe-xp-e-20leds-4-channel-rgbw-led-emitter-light-white-6000k-green-520nm-red-620nm-blue-470nm-diy-plant-grow-led-light
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It's a blurple led with white added. Not the other way around. Much cheaper than OSRAM so that's an option. Just not one I would consider.
 
V

VegasWinner

Well-Known Member
MeGaKiLlErMaN said:
It's a blurple led with white added. Not the other way around. Much cheaper than OSRAM so that's an option. Just not one I would consider.
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If the thread is about recreating the cree spectrum this is the core of the equation. These are not Blurple leds, these are 6500k white, Far Red, IR, and Royal Blue leds 3-5w. the board is a 60w element. No blurple leds. so why are you sweating me everywhere I go have you nothing else to do. Go learn about leds and gain some knowledge instead of going around and bashing others. kinda childish I think. This is he third thread you have chased me down on this week alone. Do you have issues with me? Can't help that.
 
MeGaKiLlErMaN

MeGaKiLlErMaN

Well-Known Member
VegasWinner said:
If the thread is about recreating the cree spectrum this is the core of the equation. These are not Blurple leds, these are 6500k white, Far Red, IR, and Royal Blue leds 3-5w. the board is a 60w element. No blurple leds. so why are you sweating me everywhere I go have you nothing else to do. Go learn about leds and gain some knowledge instead of going around and bashing others. kinda childish I think. This is he third thread you have chased me down on this week alone. Do you have issues with me? Can't help that.
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Show me results that state otherwise, I was following this tread before you were here.

It's not you it's the subject. Check out the dude grows show with @Growmau5 talking about why white by itself is enough. It's not a pissing match, it's about facts and since he has the most info in video form.. In regard to weed specifically, that's real world data.
 
wietefras

wietefras

Well-Known Member
@VegasWinner ,

The thing is you keep giving the weirdest advice. Started in the PWM dimming where you tell people to buy all kinds of things they don't need. You use terms incorrectly and steer people in the wrong direction in general. It sort of works, but it's far from optimal.

In this case you link to a board with 6000k, green 520nm, red 620nm and blue 470nm leds. What's the point of adding green leds? Besides that it's a burple with white. With pretty much unknown specs. I agree that it could be an option, but I doubt I'd choose that one either.
 
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