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mauricem00

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How did you arrive at that number?
the number come from the cree data sheet for a 3070 bin Z2 at 1400ma at 50C. they claim 6208 lumens. times 4 diode and divided by 4 1/2 sq ft grow area. I have not tested diodes from that bin but assume that the data from cree is accurate. I did test radiometric efficiency on a CD bin diode using a standard thermal test and the results agreed with the data from cree.
 

JorgeGonzales

Well-Known Member
the number come from the cree data sheet for a 3070 bin Z2 at 1400ma at 50C. they claim 6208 lumens. times 4 diode and divided by 4 1/2 sq ft grow area. I have not tested diodes from that bin but assume that the data from cree is accurate. I did test radiometric efficiency on a CD bin diode using a standard thermal test and the results agreed with the data from cree.
Ah, Z2 bin. Does Cree use that bin outside of 90CRI CXB3070s?

Either way, I assumed BB. Carry on, nothing to see here...although I am curious how you tested radiometic efficiency. What is a standard thermal test?
 

mauricem00

Well-Known Member
Ah, Z2 bin. Does Cree use that bin outside of 90CRI CXB3070s?

Either way, I assumed BB. Carry on, nothing to see here...although I am curious how you tested radiometic efficiency. What is a standard thermal test?
using a heatsink with know thermal coefficient measure temperature with IF thermometer. connect drive and power up diode. measure input voltage and current with DMM to determine input power, run for 20 minutes to allow system to reach thermal parody divide change in temperature by heat sink TC to determine amount of input power being converted to heat.the remaining input power is being converted to light and dividing this remaining power by total input power provides radiant efficiency. if 50 watts of input power produces 30 watts of heat then 20 watts is being converted to light for an efficiency of 40%. cree does use that bin for 80cri diodes as well. " theory is a good starting point but it rarely works in the real world without a lot of tweaking"
 

JorgeGonzales

Well-Known Member
using a heatsink with know thermal coefficient measure temperature with IF thermometer. connect drive and power up diode. measure input voltage and current with DMM to determine input power, run for 20 minutes to allow system to reach thermal parody divide change in temperature by heat sink TC to determine amount of input power being converted to heat.the remaining input power is being converted to light and dividing this remaining power by total input power provides radiant efficiency. if 50 watts of input power produces 30 watts of heat then 20 watts is being converted to light for an efficiency of 40%. cree does use that bin for 80cri diodes as well. " theory is a good starting point but it rarely works in the real world without a lot of tweaking"
Thank you, this is a great answer. How are you getting an accurate thermal coefficient? Doesn't the heatsink temperature vary depending on where you measure? What about the thermometer, do you have accurate emissivity numbers for your heatsink? My IF thermometer is crap at absolute temperature, but the rise measured from ambient might be accurate enough.

As far as bins, Z2 isn't even listed on the data sheet, and even if it exists nobody here would be running it (hopefully).
 

mauricem00

Well-Known Member
Thank you, this is a great answer. How are you getting an accurate thermal coefficient? Doesn't the heatsink temperature vary depending on where you measure? What about the thermometer, do you have accurate emissivity numbers for your heatsink? My IF thermometer is crap at absolute temperature, but the rise measured from ambient might be accurate enough.

As far as bins, Z2 isn't even listed on the data sheet, and even if it exists nobody here would be running it (hopefully).
50 watt precision resistors are design to be mounted to heat sinks and convert all of their input power to heat. I used one to calibrate my heatsink. temperature stays pretty constant across the heatsink with natural convection cooling after the system reaches stable operating temperature.with a good IF thermometer it is a good cheap way of finding actual efficiency of the unit your actually using. a cheap and dirty " ye ol engineers trick" I used a 3000k 80cri AB bin diode for the actual test and found the efficiency to be close to Crees data based on an LER of 328. this diode shows an actual efficiency of 38% at 1400ma.but performance in a comparison grow using super silver haze was disappointing. Z2 is the old listing for AB bin.I avoid high CRI diode because their output is a little lower than 70 or 80 CRI diodes.
 
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neogoes420

Member
Guys i really need help im researching for days cause i dont got money to spare to companies..
and i dont got money at all some im gonna loan from everywhere to make investment so im dead serious about this xD


I found 2 LED lights trying to replace 600 hps/mh combo to plan for long term,energy saving and saving money on ventilation
1st
https://www.amazon.co.uk/gp/product/B0186X1IB2/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A192TQ9DPH2AC
BOSSLED Ⅱ 1000W Double Chips LED Grow Light Full Specturm for Greenhouse and Indoor Plant Flowering Growing (10w Leds)

2nd
https://www.amazon.co.uk/Roleadro-Flower-Vegetable-Indoor-Growing/dp/B00WC35RJ2
Roleadro ® 300w LED Grow Light 9 Bands with IR UV Light for Flower Vegetable Indoor Plant Growing

prices will go for both (+transporting them) at : 300 euros

The questions are:
1. will i get to yield 500grams of total from 5 plants of BLACKJACK assuming i take perfect care of them.If no what the fk i need to get to 500g for a period of 3 months ?
2.should i choose this combo of lights over 600w hps and mh?
3.will those 2 leds toghether need some kind of inline fans or will do just fine with a fan blowing the enviroment inside?assuming its not so small-spaced and i open 2 little holes for passive air intake-outake


thx <3
 

mauricem00

Well-Known Member
Guys i really need help im researching for days cause i dont got money to spare to companies..
and i dont got money at all some im gonna loan from everywhere to make investment so im dead serious about this xD


I found 2 LED lights trying to replace 600 hps/mh combo to plan for long term,energy saving and saving money on ventilation
1st
https://www.amazon.co.uk/gp/product/B0186X1IB2/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A192TQ9DPH2AC
BOSSLED Ⅱ 1000W Double Chips LED Grow Light Full Specturm for Greenhouse and Indoor Plant Flowering Growing (10w Leds)

2nd
https://www.amazon.co.uk/Roleadro-Flower-Vegetable-Indoor-Growing/dp/B00WC35RJ2
Roleadro ® 300w LED Grow Light 9 Bands with IR UV Light for Flower Vegetable Indoor Plant Growing

prices will go for both (+transporting them) at : 300 euros

The questions are:
1. will i get to yield 500grams of total from 5 plants of BLACKJACK assuming i take perfect care of them.If no what the fk i need to get to 500g for a period of 3 months ?
2.should i choose this combo of lights over 600w hps and mh?
3.will those 2 leds toghether need some kind of inline fans or will do just fine with a fan blowing the enviroment inside?assuming its not so small-spaced and i open 2 little holes for passive air intake-outake


thx <3
at that price point your looking at very cheap chinese LEDs. you will be disappointed with your results using those "mars hydro" knock-offs. your yield will depend on your skills as a grower but you would get much better results with an HPS/MH combo. there is a reason that the price on those cheap leds are in free fall.they do not work very well or last very long.the 0.83 GPW your looking for can only be achieved by a skilled grower. you sound like a new grower with a lot to learn.it will take time to gain the knowledge and skills. you need be patient. no technology can replace education and hard work.
 

weed-whacker

Well-Known Member
Guys i really need help im researching for days cause i dont got money to spare to companies..
and i dont got money at all some im gonna loan from everywhere to make investment so im dead serious about this xD


I found 2 LED lights trying to replace 600 hps/mh combo to plan for long term,energy saving and saving money on ventilation
1st
https://www.amazon.co.uk/gp/product/B0186X1IB2/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A192TQ9DPH2AC
BOSSLED Ⅱ 1000W Double Chips LED Grow Light Full Specturm for Greenhouse and Indoor Plant Flowering Growing (10w Leds)

2nd
https://www.amazon.co.uk/Roleadro-Flower-Vegetable-Indoor-Growing/dp/B00WC35RJ2
Roleadro ® 300w LED Grow Light 9 Bands with IR UV Light for Flower Vegetable Indoor Plant Growing

prices will go for both (+transporting them) at : 300 euros

The questions are:
1. will i get to yield 500grams of total from 5 plants of BLACKJACK assuming i take perfect care of them.If no what the fk i need to get to 500g for a period of 3 months ?
2.should i choose this combo of lights over 600w hps and mh?
3.will those 2 leds toghether need some kind of inline fans or will do just fine with a fan blowing the enviroment inside?assuming its not so small-spaced and i open 2 little holes for passive air intake-outake


thx <3
no way those pull like 80w so that would be an insane GPW

even the discription says:
Specific Uses as a supplement of light,help plant growth

u cant afford LED now
use HPS and buy LED once u grow ur 500g
 

neogoes420

Member
guys would you recomment me getting 1,600w hps or 2,300w hps to fill the space?
or they will go more expensive because of extra ballast and hood reflectors?
 

mauricem00

Well-Known Member
guys would you recomment me getting 1,600w hps or 2,300w hps to fill the space?
or they will go more expensive because of extra ballast and hood reflectors?
higher powered lights will give you more lumens per watt.a single 600 will give you more light than 2 300s
 

ttystikk

Well-Known Member
On the advice of those in this thread and elsewhere in the LED section, I dropped well over $10k on CXB3590 based lighting.


...and covered it with my first crop.

COB LED is quite simply the finest lighting I've ever grown plants under indoors, full stop.

That is all.
 

Indefinately

Well-Known Member

I take it you don't like the k5-xl1000?

On the advice of those in this thread and elsewhere in the LED section, I dropped well over $10k on CXB3590 based lighting.


...and covered it with my first crop.

COB LED is quite simply the finest lighting I've ever grown plants under indoors, full stop.

That is all.
I'm in Australia, can't seem to find the cxb3590 on any online shops.

How many lights did you get for 10k buddy?

I'm thinking about buying one to compare to HPS for myself. Then I will replace all of my lights if I'm happy.

Happy to spend the money to get the best light.
If it competes with my HPS I'll be wrapped with the power savings ( lights and air con ).

Any Aussie growers with a place to buy the cxb3590?

Or any feedback on the k5-xl1000
https://www.amazon.com/XL1000-Light-Ratches-Active-glasses/dp/B00RQKNP04

Indefinately
" Let there be Green in 2016 "
 
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