Need help designing a DIY CREE set up

C

churchhaze

Well-Known Member
Check out https://octopart.com/

Once you know the manufacturer model number for the part you want, check octopart and it will show you the price of all the major online electronics stores. That should give you a good idea of what the stores are too.

mr mike hunt said:
Aliexpress is legit? Guess Ive always been skeptical of that site.

Does Digi-Key ever have AB or Z4 bins?
Click to expand...
 
C

churchhaze

Well-Known Member
C

churchhaze

Well-Known Member
Since @SupraSPL suggested to use 18-20, it would make sense to get 4x HLG-185H-C1050 and go for 20 cxa3070 for that area.. Then design everything around that.... Probably 4 panels/sinks.. something like that.

According to supra's spreadsheet, that would give you approximately 45% efficiency with the 3000k AB bin, which is pretty amazing.
 
Last edited:
C

churchhaze

Well-Known Member
That is a question I can not answer. I do not know if it is worth it. I bet the AB bin will become more available over time and will come down in price. It's a tough call, and there's no way to distinguish the 2 bins by looking at the cobs, so some more shady dealers could be misleading people in some way. (like listing 2 color temperatures in the title, then putting AB, when AB is for the other color temperature, where it's not the highest bin) Only 3000k AB is the top bin.
 
Goldy

Goldy

Well-Known Member
churchhaze said:
That is a question I can not answer. I do not know if it is worth it. I bet the AB bin will become more available over time and will come down in price. It's a tough call, and there's no way to distinguish the 2 bins by looking at the cobs, so some more shady dealers could be misleading people in some way. (like listing 2 color temperatures in the title, then putting AB, when AB is for the other color temperature, where it's not the highest bin) Only 3000k AB is the top bin.
Click to expand...
is there a list somewhere of all the top bins for each dif colour temp of the 3070s?
 
R

reasonevangelist

Well-Known Member
Goldy said:
is there a list somewhere of all the top bins for each dif colour temp of the 3070s?
Click to expand...
you could make one in a reasonably short amount of time, by just looking at the 3070 datasheet. Hint: each color temp rating has different "top bin" codes. They're not binned "that way." ;)
mr mike hunt said:
Is paying an extra $20 for an AB bin worth it over a Z4 bin?
Click to expand...
Nope.

The only differences are a SLIGHT efficiency increase, expressed as slightly more light-power per energy unit.

If cost isn't a big issue, and you were going to build something you wanted to keep using for its entire lifespan, sure, go with the highest bin you can get, even at a premium.

Otherwise... Nope. Z4s are plenty good enough, not significantly less bright in any relevant way, unless you're working within very tight and exacting power and heat constraints.

In short: don't worry about the diff between Z4 and AB, unless you're just ultra-picky and have zero wiggle room in power availability or heat dissipation (in which case, you should probably consider those aspects, prior to building a beastly LED rig...). :)
 
C

churchhaze

Well-Known Member
"REMARK:Sometimes our stock is AB BIN,But mostly our stock is Z4 BIN,pls contact me"

I think a few people here have ordered from that guy, including @SupraSPL

Because there's no way to know if it's really Z4 or AB by looking at the cob, and he's already mislead you into thinking it's AB by the title, I wouldn't trust this guy... even though his ad clarifies... it's sort of like people selling 200mil silver bars (plated) at the price of solid ones in hopes people will buy them thinking they're solid bars. It's not lying, but it's very misleading to people who aren't careful.

And who knows... he's probably lying... They're probably all Z2


mr mike hunt said:
I found some AB bins for $65 per COB, seemed way high. Z4 COB is around $40. So a $25 difference.

http://www.aliexpress.com/store/product/Freeshipping-1pcs-Cree-XLamp-CXA3070-led-74-117W-COB-EasyWhite-5000K-Warm-White-3000K-LED-Chip/815938_2052849889.html

Is aliexpress a legit place to order from?
Click to expand...
 
medicinehuman

medicinehuman

Well-Known Member
FranJan

FranJan

Well-Known Member
Ali's legit. Whether the seller is legit is another story ;). Good catch ChurchHaze + MH!

I guess the only time you really need that highest bin is if your buying and running a shitload of CoBs. My question as always is where is the acceptable line? Just like sweet spots for running performance, which bin gives you about as much you can ultimately yield? Or maybe it just doesn't work that way :???:.
 
medicinehuman

medicinehuman

Well-Known Member
I went through some pages in the DIY and found that on Dec. 1 2014 Supra received AB BIN from her, he tested them. But check to see what bin they are for sure by contacting her.
 
M

mr mike hunt

Member
Id rather order from someone in the US, not China if at all possible. But I don't want to get raped price wise. Maybe I will make calls on Monday and see when the US suppliers will have some in stock.
 
Abiqua

Abiqua

Well-Known Member
churchhaze said:
That is a question I can not answer. I do not know if it is worth it. I bet the AB bin will become more available over time and will come down in price. It's a tough call, and there's no way to distinguish the 2 bins by looking at the cobs, so some more shady dealers could be misleading people in some way. (like listing 2 color temperatures in the title, then putting AB, when AB is for the other color temperature, where it's not the highest bin) Only 3000k AB is the top bin.
Click to expand...
When you actually go to checkout there is an option for the two choices, I would say it is misleading not outright forgery....I am satisfied with mine. I bought mine the day before Supra ......actually a friend recently borrowed my diy lights because they have lux meter....just going by lumens it was 2-3% higher than AB listed....now this is 2nd hand because I wasn't actually there, but my buddy is 5k deep in HPS and he wants out and I let him test my cobs for me....win win
 
R

reasonevangelist

Well-Known Member
FranJan said:
Ali's legit. Whether the seller is legit is another story ;). Good catch ChurchHaze + MH!

I guess the only time you really need that highest bin is if your buying and running a shitload of CoBs. My question as always is where is the acceptable line? Just like sweet spots for running performance, which bin gives you about as much you can ultimately yield? Or maybe it just doesn't work that way :???:.
Click to expand...
honestly, i think it's a more dynamic, case by case thing. It comes down to whether your value of the extra dollars is an acceptable trade for your measurable gains... even if that ends up just being an irrational personal preference gratified, resulting in personal contentment.

There's probably a threshold in relation to all relevant location constraints. There's probably a point at which spending more doesn't make sense anymore, and it's probably different for each spot and situation. There might be some kind of... ambiguous "formula" or heuristic or whatever, to apply to it... some sort of reliable method to determine just how much heat and power-cost and etc., you can get away with, before causing problems, or before reaching the point where adding more won't really do you any good, because you've maxed out your space. /shrug!

I suppose the best thing to do in this situation, is smoke on it some more. (and by that, i mean think as both tesla and jung would suggest: naturally, in terms of waves, frequency, vibration...)

Surely a biological photosynthetic organism has some sort of... upper limit, to the amount of photosynthesizing it can do in any given period, under given* circumstances.

Someone should do a thesis on optimizing the relationships among all interrelated factors, and attempt to devise a formula to figure out exactly how much of what, is "best," per volume of available/used space (and of course, define the problem much more articulately than i just did).
 
Last edited:
You must log in or register to reply here.
Top