Cree CXA3050 100W Custom LED Grow Journal with Dinafem Blue Widow

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mtnstream

Active Member
bb, $36 for cob + $18 driver = $54 / 50 w = $1.08/watt ? Reduce drivers a bit to 70-75 w and still a great value w/$.
Heatsinks can be done cheap with recycling alum frames.
 
SupraSPL

SupraSPL

Well-Known Member
Glad to see you got some nice nugs! I have a Blue Widow that I love and gets good reviews from friends. All said and done how did the nugs compare against the HPS you are used to?

bbspills said:
I ended up purchasing 2 LED's from digikey (CXA3050-0000-000N00W227F-ND). Digikey reports lumen output of 5683 at a color temperature of 2700K
Click to expand...
For comparison purposes, here are the numbers from the Cree datasheet, assuming a Tj of 50c (lots of heatsink). This is the way I normally calculate efficiency, using the minimum numbers for the bin.

.35A 12W - 140lm/W - 40%
.7A 25W - 121lm/W - 35%
1.05A 38W - 107lm/W - 31%
1.4A 53W - 98lm/W - 28%
1.8A 70W - 91lm/W - 26%

Digikey's numbers are suspect because they report 5683 lm for a variety of LEDs of different color temps which is virtually impossible. They also use the number 6094 repeatedly. So take these numbers with a huge grain of salt. Digikey did not specify the junction temp of their test but if we use their numbers and assume their Tj was 85c
.35A 12W - 164lm/W - 47%
.7A 25W - 142lm/W - 41%
1.05A 38W - 125lm/W - 36%
1.4A 53W - 114lm/W - 33%
1.8A 70W - 106lm/W - 30.6%

For comparison, brand new 600 HPS bulbs are about 150lm/W, 40% efficient and 2200K. Of course we cannot compare these numbers directly with the LED numbers but it does give some idea at least.
 
B

bbspills

Well-Known Member
SupraSPL said:
Glad to see you got some nice nugs! I have a Blue Widow that I love and gets good reviews from friends. All said and done how did the nugs compare against the HPS you are used to?



For comparison purposes, here are the numbers from the Cree datasheet, assuming a Tj of 50c (lots of heatsink). This is the way I normally calculate efficiency, using the minimum numbers for the bin.

.35A 12W - 140lm/W - 40%
.7A 25W - 121lm/W - 35%
1.05A 38W - 107lm/W - 31%
1.4A 53W - 98lm/W - 28%
1.8A 70W - 91lm/W - 26%

Digikey's numbers are suspect because they report 5683 lm for a variety of LEDs of different color temps which is virtually impossible. They also use the number 6094 repeatedly. So take these numbers with a huge grain of salt. Digikey did not specify the junction temp of their test but if we use their numbers and assume their Tj was 85c
.35A 12W - 164lm/W - 47%
.7A 25W - 142lm/W - 41%
1.05A 38W - 125lm/W - 36%
1.4A 53W - 114lm/W - 33%
1.8A 70W - 106lm/W - 30.6%

For comparison, brand new 600 HPS bulbs are about 150lm/W, 40% efficient and 2200K. Of course we cannot compare these numbers directly with the LED numbers but it does give some idea at least.
Click to expand...

The nugs are dense and the smoke is great. Makes my wife giddy all day.

Blew away my previous DS100 light. Not to mention the smell is really strong. One tiny nug stinks up the whole area.

Considering how small my area is, I think I would be hard pressed to top my output. I pulled 4oz's off one plant and I still had space left over to pull off even more.

Right now I have two plants (C99 and Blue Widow) in my cabinet in hopes to completely utilize all my space and will probably be switching to flower in the next week or so.

I'm striving to pull 5oz's this go round!!

Thanks everyone for your support
 
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bbspills

Well-Known Member
About 4-5 degrees Fahrenheit. There's actually a formula you can use to compute how much CFM you need to keep a desired temp for a given cubic feet and total watts.
 
Cococola36

Cococola36

Well-Known Member
hey bbspills, you inspired me to do something of the same sort with my old apollo 16 i got lying around. While i won't use all 16 cluster areas (overkill) , I was wondering if these drivers will be suffice for the cxa3050 or maybe even 3070? other than the info on the driver it is 1450ma ( i have 8 of them so i hope they aren't a waste lol)
IMAG0180.jpg
 
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bbspills

Well-Known Member
Cococola36 said:
hey bbspills, you inspired me to do something of the same sort with my old apollo 16 i got lying around. While i won't use all 16 cluster areas (overkill) , I was wondering if these drivers will be suffice for the cxa3050 or maybe even 3070? other than the info on the driver it is 1450ma ( i have 8 of them so i hope they aren't a waste lol)
View attachment 2954746
Click to expand...
Those should work just fine for the CXA3050 or CXA3070
 
SupraSPL

SupraSPL

Well-Known Member
samne said:
Aliexpress sells cxa3050 at 257 $ per lot (10 pcs).
Can that be real?
Click to expand...
They don't specify the part number or bin so I would assume the worst. Better off with a trusted source that takes the time to let us know what we are buying. I'm sure they would not appreciate it if we said we would pay them with 10 bills but failed to specify which 10 bills.
 
digimidgi

digimidgi

Well-Known Member
bbspills... Thank you for sharing your work. Really inspiring! Can you recommend or do you know of a DIY LED panel guide?
i'd like to build something very similar to yours but I'd be using a breadboard. X
 
B

bbspills

Well-Known Member
digimidgi said:
bbspills... Thank you for sharing your work. Really inspiring! Can you recommend or do you know of a DIY LED panel guide?
i'd like to build something very similar to yours but I'd be using a breadboard. X
Click to expand...
No need for a breadboard if you are using COB leds as you just mount directly to heatsink and solder as they come directly on the pads ready to go.

I only see the need for a bread board if you were using single diodes like the cree xm-l
 
digimidgi

digimidgi

Well-Known Member
bbspills said:
No need for a breadboard if you are using COB leds as you just mount directly to heatsink and solder as they come directly on the pads ready to go.
Click to expand...
Oh yeah:) So what exactly do i need? The COB LED's, LED Drivers, Power supply, Thermal paste, Wires, Heat sinks, A structure with some sort of reflector thing..
What am i missing? I need a dummies guide:)

Sorry/Thanks a squillion
 
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