http://www.bridgelux.com/sites/default/files/resource_media/DS74 SMD 2835 0.2W 3V Gen 2 Data Sheet 20170323 Rev A.pdf
@ANC here are the diods I would like to use. But I can‘t answer any of your questions
What I like is, that the diods are less powerful, so I can get way more, no?Have a closer look to the LM561c. The bridgelux diodes needs 20mA to reach 190lm/w in 3000°k, the LM561c can do 197lm/w at 60mA and 202lm/w at 50mA. They benefit much less from lower current. Run an EB strip at half current and effiency increase from 175lm/w to maybe 185lm/w.
But a F-strip with half current will get lets say ~525mA or ~11,8w(58,34mA per diode) and will reach theoretically 200lm/w before driver and wall loss. System effiency should be ~180-190lm/w depending on the distance, but I'm pretty sure a plant can grow directly into the light without any damage.
I think this is optimal if you do not have much space upwards and with the upfront costs, I can get away. My last COB based lights with mono's were significantly more expensive. With EB gen2 strips I would never reach that point of effiency also when driven ultra low(175 instead of 700mA), maybe with 100mA.
Same here. 1 f strip is putting out twice as much light, as 1 eb strip. So for me, it‘s better getting 2 eb strips, than 1 f strip, because I can spread them! And I needed 1ft strips, which were not avaible as f strips (atleast 1 year ago, did it changed?)Comparision with EBgen2 and F-series strips at nom. current.
Unfortunately I have only the 3000°k #‘s ...(*)
EB Series Gen2 3000K@700mA(87,5mA per diode)
QER=4.84 µmol/J
LER=331.66 lm/W
= 2.55 µmol/J
13,65w * 2,55μMol/J / 7,40$ = 4,70μMol/$
F-Series Gen3 3000K@1120mA(124mA per diode)
QER=4.86 µmol/J
LER=321.60 lm/W
= 2.54 µmol/J
25.8W * 2.54 µmol/J / 14.48$ = 4.53 µmol/$
Not a big difference. F-series costs twice as much but delivers twice as much light. Only a minor benefit for the EB's...
I would love to do it my own!!! But I just don‘t have the skills! I thought about letting some chinese manufacture do it, but in the end I decided, that I am not rich, and that I don‘t want to gamble. And EB strips give me the most diods, which I can spread out nicely, because they are not that powerful than the lm561c. I was also looking into other strips, but I didn‘t found any other. The all had <150lm/wI know they are great at low currents, but those are at levels lower than I can justify the density it would take compared to other options.
If I wasn't kinda in a hurry to get them and be done with it, I'd order a few rolls of diodes and get to work making my own.
It will be soul breaking work placing that many diodes by hand, but I have done worse.
Like I said, I want to learn it this year. But I have a big garden with alot of vegetable, and I needed a new light from january - may. When all plants go outside, I will try to learn to solder / make my own pcb.Doesn't take much skill. Then again I have been soldering since I was maybe 12 or so.
What I like is, that the diods are less powerful, so I can get way more, no?
3x smd 2835 vs 1x lm561c
By the way, do you know if the eb strips gen are using these smd2835?
Like I said, I want to learn it this year. But I have a big garden with alot of vegetable, and I needed a new light from january - may. When all plants go outside, I will try to learn to solder / make my own pcb.
I will make my dream of an illuminated cab come true, but up to this point, I will be fine with it, being called crazy, because I want more and more diods
Yeah, thats what I was reading about. But I haven‘t found these hotplates, because I am missing the terminology. Do you have a link? (German/europe vendor?) Even small ones like 5“x5“ would be fine, because I could glue them on a bigger alu sheet, or c-channels. I don‘t have a thermometer, but this should be easy to get, I think.There are small hotplates to solder smd's or you can also use a stovetop if you have a good thermometer with probe. Heat it up to 260°C, place the PBC on the plate with solder paste(230°C melting point) and LED's in place and measure the temperature.
The PCB should reach 250°C within 2-3 minutes, then let it slowly cool in the oven. I've not tried it with bigger PCB's only with small ones(12 diodes) but it should work the same way.
Hey DankBudzzz!Why is the DigiKey website so difficult to navigate... does anyone have a link to the 3000 and 5000 k strips on DigiKey Canada. Do they come in 2 feet strips? Can anyone suggest an exact driver model to run 10 strips at around 200 watts total? Thanks