see4
Well-Known Member
is that sqft? or ft?
New style Samsung LM561C Board
- Thread starter chuckduck
- Start date
Randomblame
Well-Known Member
Hi Mo,Have you any links for the 1750K 'fresh meat chips' in EU / UK?
Found them yesterday on e3ay sold as full spectrum grow tubes. Each strip inside the 2ft. tubes contains 48 SMD2835 diodes with a 1850°k phosphor layer. I've ordered 10 2footers yesterday and will test them as soon as they arrive but I'm pretty sure the efficiency is not comparable, maybe 70-80lm/w if any..
Had them first seen on Alibaba, but the shipping costs ... you know? These tubes here use the same strips and I could find them postage free on e3ay. I am sure, if you are looking for the e3ay article number, you will find it on ebay.uk with free shipping.
I'll disassemble them and take the strips out, they're probably built in 8s6p or so, so you can hang them probably on a 24v driver. But I'll see that when I break them down.
I think, in the tubes sits a small 360mA driver, so that the LEDs are running at 60mA(~9w). If so, this gives plenty of room to overdrive the diodes because SMD2835 can handle up to 150mA. One could drive them with up to 900mA/~22w with proper cooling. But thats only my estimations, we will see it soon.
https://www.ebay.de/itm/T8-LED-Pflanzenlampe-Tube-9-18W-60cm-90cm-120cm-Leuchtstoffrohre-Volles-Spektrum/182907252228?_trkparms=aid=555017&algo=PL.CASSINI&ao=1&asc=20160630134825&meid=bed6fa41d4bb44029c91cbc9b495c02a&pid=100507&rk=1&rkt=1&&_trksid=p2045573.c100507.m3226
Randomblame
Well-Known Member
sf², edited, thanks!
Randomblame
Well-Known Member
Randomblame
Well-Known Member
Haha,Maybe the form factor is right to slip in some Samsung boards
Actually, you get cool diffuser films these days. Some will bend light sideways like for pool lighting.
One could use it on strips on the edge to add light around the borders.
I thought so synonymous, but the heatsinks measure only 200x 250mm and are too small for Quantumboards.
ANC
Well-Known Member
I meant the F types, the thinner strip is only about 20mm wide. I think it is some kind of standard.
Saw some heatsinks last night with a slot in the bottom for holding the boards and a groove on top that the diffuser film goes into, obviously, you would lose a small amount of light.
But these films are getting really good.
Saw some heatsinks last night with a slot in the bottom for holding the boards and a groove on top that the diffuser film goes into, obviously, you would lose a small amount of light.
But these films are getting really good.
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Randomblame
Well-Known Member
Yeah, I also saw the diffuser films, but discarded their use.
Why?!
We already have 72 small light sources on a 2ft. strips so the light is already diffuse. I see no reason to make already diffused light even diffuser.
F***! Hope this makes sense!
The good thing about these strips is that you can do it without such complex heatsinks. Aluminum c-channels are quite sufficient, even with max. current. The passive temperature comparison w./wo. c-channel I've found in the EB-strip thread and as you can see c-channels work very well. Imagine how the values would sink further with some air movement!
It's really not necessary to spend extra money for cooling or diffusing. Instead, take more stripes and let them run more efficiently. More light sources make the light also more diffuse and you may be able to do it without any heatsinks.
Edit:
You don't need thermal grease with strips. Simply screw them to the channel..!
Why?!
We already have 72 small light sources on a 2ft. strips so the light is already diffuse. I see no reason to make already diffused light even diffuser.
F***! Hope this makes sense!
The good thing about these strips is that you can do it without such complex heatsinks. Aluminum c-channels are quite sufficient, even with max. current. The passive temperature comparison w./wo. c-channel I've found in the EB-strip thread and as you can see c-channels work very well. Imagine how the values would sink further with some air movement!
It's really not necessary to spend extra money for cooling or diffusing. Instead, take more stripes and let them run more efficiently. More light sources make the light also more diffuse and you may be able to do it without any heatsinks.
Edit:
You don't need thermal grease with strips. Simply screw them to the channel..!
Randomblame
Well-Known Member
Up to 1050mA you can test it without a heatsink. Only when they reach 85°C I would stop going higher. For a quick 1,4A test also a small sheet or any other metallic surface is enough. And like I said, you don't need any TIM because of the low thermal pressure. Many members are using double sided thermal tape but it's hard to remove and I would use it only in the final build not for testing pourposes.
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Randomblame
Well-Known Member
Something like this, but it stinks like hell.
I think when I glue 20m of the stinky tape, I need a gas mask or at least wide open windows, Lol! Hopefully no harmful PVC plasticizer, this s*** is able to harm the plants.
Thank goodness, the stench disappears after a few days ..
I think when I glue 20m of the stinky tape, I need a gas mask or at least wide open windows, Lol! Hopefully no harmful PVC plasticizer, this s*** is able to harm the plants.
Thank goodness, the stench disappears after a few days ..
Randomblame
Well-Known Member
Yeah! Hard to find those little bastards!Thanks Randomblame, Nice find , I'll investigate further but I should have been more specific.
It was the @PSUAGRO. "Bridgelux" 1750K cobs I'm after.
Negotiating the digikey site is a complete pain in the aris for me lol
And then only if you take 100 or so.... no luckily not in case of Vero29
Part-No. for Vero18 fresh meat is BXRC-17E4000-B-74(C or D if you want the other versions) and the best way to find what you want is to know the part-no. and apply it into the search engine.
Vero18 food series, only in increments of 100:
https://www.digikey.de/products/de?keywords=BXRC-17E4000-B-74
Vero29/1750°k seems only available in SE edition but you can luckily get only one for ~30$ +VAT:
https://www.digikey.com/product-detail/en/bridgelux/BXRC-17E10K0-C-74-SE/976-1645-ND/7033058
PSUAGRO.
Well-Known Member
Maybe @RainDan can help you out?I think they ship Internationally? I know they don't sell just the chips but they build on site in san diego, have them in inventory.......dan will usually take care of the RIU community, within reason.Thanks Randomblame, Nice find , I'll investigate further but I should have been more specific.
It was the @PSUAGRO. "Bridgelux" 1750K cobs I'm after.
Negotiating the digikey site is a complete pain in the aris for me lol
worth a shot(PM a quote), or just add some osram hort 660nm "strips" to 3000k-4000kcobs like random did from the german site.
Moflow
Well-Known Member
Thanks mate.
I thought it was just me but they appear as rare as hens teeth!
But I'm not giving up.... lol
Moflow
Well-Known Member
Thanks my friend, I'l look into it.
I'm running 3 x cheapo 10 watt deep reds now over one plant to see the outcome.
It' so hard keeping up with the threads but I'm sure they don't stock them 660nm osram @Randomblame strips now?. They sound good tho.
I don't want to use individual 3w 660nm leds unless absolutely necessary but if they sold them in the ready made strips, well, I'm your man.....
Moflow
Well-Known Member
PSUAGRO.
Well-Known Member
https://www.led-tech.de/en/OSRAM-Oslon-SSL-80-hyper-red-Array-528nm
You want all hyper red with "white" , plenty of blue already imo
80 degree oslons w reflector/lenses on cobs, 120 if bare ==which I prefer