BigYellowCob
Well-Known Member
I'd like to know the cost and a link on those heat sinks too - they look bulky enough to handle a few watts passively. Also, how does a 50k pot vs 100k pot on a single driver affect dimming? Can you only dim 50%?
Pictures of your DIY lights - Post your pics!!!
- Thread starter TimeToBurn
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littlejacob
Well-Known Member
Bonjour
And what kind of driver do you use?
Did you try it already?
How far from light you have to put the plant?
Have a great day ★
And what kind of driver do you use?
Did you try it already?
How far from light you have to put the plant?
Have a great day ★
Stephenj37826
Well-Known Member
I'm thinking if you use 50k you'd only get 50%-10%
Stephenj37826
Well-Known Member
I think to get 50%-100% you'd need a 50k resistor and the 100k potentiometer if dimming a single driver.
Sxott
Well-Known Member
DELL Heatsink Shroud Assembly 0J7109 0G9096 0H9073 0P211D 0Y4574 H7058 is what the ad said.
I found 20 of them on Craigslist for 50 bucks. They have 20 watts of LED on each and only get slightly warm. Thats in a 77° room with no air movement.
The 50k pot only dims it down to 50% I couldn't see needing lower than that with these 18s. It dims smoother than if I were to use 100k.
HLG-185H-C700B is the driver.
My lux meter is reading 15,000 lux. Thats about 225 ppfd at 18" Higher numbers than my 400 MH.
It has not been over my plants long but Im seeing new growth every day.
littlejacob
Well-Known Member
Bonjour
Are you sure that the pot dim down to 50%?
I would say it goes from 50% to 0 (if you do not have resistor 10k)!
And your hs are cheap...
CU
Are you sure that the pot dim down to 50%?
I would say it goes from 50% to 0 (if you do not have resistor 10k)!
And your hs are cheap...
CU
Sxott
Well-Known Member
littlejacob
Well-Known Member
Sorry but I am pretty sure that I am right...
But you should ask someone who know better than me...like supraspl...
Sorry I am not 100% sure and I don't want to say bullshits!
CU
But you should ask someone who know better than me...like supraspl...
Sorry I am not 100% sure and I don't want to say bullshits!
CU
Sxott
Well-Known Member
When I put 100k on there it dims all the way down to nothing. I was under the impression that the higher the resistance, the lower it goes. The pot goes from zero resistance - 50K ohms.
I hope your right because then my light will be 2x brighter if I swap out pots.
The light looks just as bright without a pot on it at all.
I hope your right because then my light will be 2x brighter if I swap out pots.
The light looks just as bright without a pot on it at all.
Getgrowingson
Well-Known Member
What is the voltage across your dim wires? If it's any less then 10v your running at less then 100%
Getgrowingson
Well-Known Member
Theoretically Jacob is right you would only have 50%
littlejacob
Well-Known Member
I believe too...lol
If you had a 100k pot and a 50k resistor you would go from 100% to 50%...
CU
If you had a 100k pot and a 50k resistor you would go from 100% to 50%...
CU
BigYellowCob
Well-Known Member
Alesh posted this today in another thread, presumably from the MW spec sheets.
I'm gonna have to look for heat sinks on Craigs list now too. I'd love to find a good deal on some aluminum to use for other projects.
I'm gonna have to look for heat sinks on Craigs list now too. I'd love to find a good deal on some aluminum to use for other projects.
Stephenj37826
Well-Known Member
It is the other way around. If you didn't hook up potentiometer at all it would be 100% which is infinite resistance. Hook wires together 0 resistance. So 100k is 100% 50k 50% so on
Sxott
Well-Known Member
Thanks for straighten me out fellas. I was thinking the 50k pot would only let me dim it down to 50% (not start at 50) I do have almost 5v across the pot. Thats great news. Ill see if I have a 100k in my build boxes somewhere or swing by radioshack tomorrow. I will prob still keep it at 50% because it seems to be a good spot for my veggers and they seems happy.
The only down side is if I ever turn it up, the heat sinks might get too warm but, I already was planning for that to happen before the build. Part of the reason the 12v supply is there. Im going to take some large aluminum rain gutter with holes cut out on the bottom for the heatsinks and a fan in the top middle and make a channel on each side for air flow.
Thanks again guys
The only down side is if I ever turn it up, the heat sinks might get too warm but, I already was planning for that to happen before the build. Part of the reason the 12v supply is there. Im going to take some large aluminum rain gutter with holes cut out on the bottom for the heatsinks and a fan in the top middle and make a channel on each side for air flow.
Thanks again guys
cdgmoney250
Well-Known Member
(15x) Vero 29 3500k @ 1.4a 937 watts
3 rails of 5 (48"x30")
Spacing is 11 1/8" between the 5 per rail and 13" between rails.
3 rails of 5 (48"x30")
Spacing is 11 1/8" between the 5 per rail and 13" between rails.
cdgmoney250
Well-Known Member
For reference...
cdgmoney250
Well-Known Member
Thank you very much.
The reflectors are made by Ledil and are called Angelina-XW 90 degree.
I picked them up at Mouser for about $10 a pop.
http://www.mouser.com/ProductDetail/Ledil/F13838_ANGELINA-XW/?qs=sGAEpiMZZMt82OzCyDsLFOPuE06SNYbxdJgYPnMRCZ8=
You will also need the Base Plate. I think its called a Vero Clamp or something of the sort. Those cost about $2.50 ea.
http://www.mouser.com/Search/ProductDetail.aspx?qs=7jhocJ3ivuR/iW1gLfrJ0A==
The reflectors are made by Ledil and are called Angelina-XW 90 degree.
I picked them up at Mouser for about $10 a pop.
http://www.mouser.com/ProductDetail/Ledil/F13838_ANGELINA-XW/?qs=sGAEpiMZZMt82OzCyDsLFOPuE06SNYbxdJgYPnMRCZ8=
You will also need the Base Plate. I think its called a Vero Clamp or something of the sort. Those cost about $2.50 ea.
http://www.mouser.com/Search/ProductDetail.aspx?qs=7jhocJ3ivuR/iW1gLfrJ0A==