CoB_nUt
Well-Known Member
Older than dirt Adam West,my good man of course.Now Are We Talking Old School Michael Keeton?? Or Older Than Dirt School Adam West??? Bam Pow Ka Boom
DIY Passive cooling with PIN Heatsinks SST120 and SST140
- Thread starter robincnn
- Start date
The Dawg
Well-Known Member
captainmorgan
Well-Known Member
Those are Springtails and a sign of healthy soil. I have lots of those plus the good mites in my octopots,the ST's swim in the res and the good mites seem to like the area between the res and soil.
captainmorgan
Well-Known Member
Malocan
Well-Known Member
Hello,
post # 689 and post # 697 on this thread, robin shared some numbers
edit: page 35
captainmorgan
Well-Known Member
Thanks
Lopez7808
Active Member
Hey dropping some information on a Portland guy who is getting ready to manufacture cxb casing for the DIY crowd. They will be 28" x 28" x 2 1/2" or 3" he said they will be blanks meaning no holes and unpainted. Drop the guy a email if interested dracoledsystems@gmail.com.
robincnn
Well-Known Member
@captainmorgan
Currently I have them for $24.75 each. Will be down to $24 in 10 days.
For 18pcs box. It will be around $22 each.
Another price break for 50+ pcs
They are more expensive than the $19 SST140. This is due to new mold cost for splay process, cost for plastic packaging and bigger boxes.
140mm were wrapped in bubble bag and the pins bent as they hit each other in shipping.
SST X runs about 7C-8C cooler than SST140 at around 100 watts.
SST X runs about 5C-6C cooler than SST140 at around 75 watts.
I made this one with 100 COB watts per heatsink
Currently I have them for $24.75 each. Will be down to $24 in 10 days.
For 18pcs box. It will be around $22 each.
Another price break for 50+ pcs
They are more expensive than the $19 SST140. This is due to new mold cost for splay process, cost for plastic packaging and bigger boxes.
140mm were wrapped in bubble bag and the pins bent as they hit each other in shipping.
SST X runs about 7C-8C cooler than SST140 at around 100 watts.
SST X runs about 5C-6C cooler than SST140 at around 75 watts.
I made this one with 100 COB watts per heatsink
captainmorgan
Well-Known Member
Thanks robinccn, have you done any comparisons with lower drive currents, like 1400ma and 1050 ma?
robincnn
Well-Known Member
@captainmorgan
No i did not test 140 vs splay at lower current. 75 was min.
Let me know if you have any recommendation for a test and I will try to get it done this weekend.
At 1400ma i recommend 120mm. 1050ma with 105mm
at 50 watts the difference between the 120mm and 140mm is very small. 2C-4C i think. 140 has thicker pins. 120 has thinner and a lot more pins.
Going overkill on passive does not help much. Only adds cost and weight.
Assuming airflow in grow space the 120 and 140 may perform within 1C.
No i did not test 140 vs splay at lower current. 75 was min.
Let me know if you have any recommendation for a test and I will try to get it done this weekend.
At 1400ma i recommend 120mm. 1050ma with 105mm
at 50 watts the difference between the 120mm and 140mm is very small. 2C-4C i think. 140 has thicker pins. 120 has thinner and a lot more pins.
Going overkill on passive does not help much. Only adds cost and weight.
Assuming airflow in grow space the 120 and 140 may perform within 1C.
captainmorgan
Well-Known Member
It would be easy for people to make a decision on heatsinks if you could make up a chart with the different sizes and currents with their junction temps,even with lower currents.
Lopez7808
Active Member
@captainmorgan , I will have to agree with you on that Sir
BuddyColas
Well-Known Member
Now I'm not pissing in your Cheerios mate, but the NGL site has all the numbers you need...in my opinion.
SST105
Recommended Watts** 25W to 35W Led or 20W Heat
Thermal Resistance** 1.2 C/W
SST120
Recommended Watts** 35W to 60W Led or 35W Heat
Thermal Resistance** 1.00 C/W
SST140
Recommended Watts** 50W to 80W Led or 25W to 50W Heat
Thermal Resistance** 0.75 C/W
SST X-rated!
Recommended Watts** 80W to 100W Led or 60W Heat
Thermal Resistance** 0.60 C/W
captainmorgan
Well-Known Member
I know the recommendations but it would be nice to see the real junction temps at the different currents.
robincnn
Well-Known Member
@BuddyColas those are estimates online. The thermal resistance changes non linearly with wattage.
Will test case temps some with Cree 3590 next week at different current and report back.
The test data is under no air movement and things change a lot in tent with air movement
Hard to test check case temps with Vero 29 as Tsp is not easily accessible. No Tsp with Citizen.
Will test case temps some with Cree 3590 next week at different current and report back.
The test data is under no air movement and things change a lot in tent with air movement
robincnn
Well-Known Member
@The Dawg Please share Tea recipe for my tomato plant when you get time.
Moved my tomato plant from a 3 gallon to a 5 gallon pot.
2x2.5 tent. Photon 180 lamp 190 watts
Canopy is thick and leaves on top feel a little moist... should i do some trimming to improve light penetration and avoid mold?
Moved my tomato plant from a 3 gallon to a 5 gallon pot.
2x2.5 tent. Photon 180 lamp 190 watts
Canopy is thick and leaves on top feel a little moist... should i do some trimming to improve light penetration and avoid mold?