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Sounds like that light is using XM-l2's. Are we positive that the SK uses XB-D's and not XM-l2's? That would change things quite a bit if they did...

That is an incredibly presumptuous remark. Completely dependent on a list of variables almost too long to write down.

Maybe they were trying to use reverse psychology marketing... Tell you that you don't want one so much that you get one out of spite haha

I think the LED section of RIU is dedicated to more than just DIY lamps... And I also believe that the OP started this thread referring specifically to SK yields and whether the lamp was worth the money or not. (Then they disappeared never answering even very simple questions about the grow...

I completely agree with that quote. I'm also tired of all this efficiency talk when its mostly theorized calculations based on individual diode performance.. from a data sheet. To me, gardening efficiency should be based on a Grams Yielded/ Luminaire Watts Drawn. Electrical efficiency is pretty...

It's pretty high above the canopy right now.. I just chopped off about 16" over the weekend, but kept the lights where you see them now. I have to add a few more COB's so I don't have to have the lights so high. Covering an 8x8 right now with 740 watts drawn. They are getting flipped within...

I believe that they are still Bright Light LED.. But selling the Spectrum King as their "brand" of grow light. As far as the Cree endorsement goes.. I'm just guessing on this one, but I can't imagine Cree backing a product/company making false claims about their product. Doesn't make any sense...

I actually did a flower run like that. Initially it was purely supposed to be a veg light but I decided what the hell and flowered under it as well. I have12 CXA3070. 6 are 3k and 6 are 5k. Driven at 1.4a in a staggered alternating pattern. I noticed there was much better trichomes and girth...

No offense, but this thread has gone from talking about commercial lamps not being cost-effective, to making heat sinks out of aluminum foil and steel wool. Holy Fucking Shit.

So $800 to cover a 2x4 square when you literally have to make the light yourself?? And that is just for parts. If someone started to sell these "64% efficient " fixtures to cover a 4x4 space it would cost approximately $1500-$1600 just in parts. So assuming you didn't do work for free, or sell...

On a side note, since there is a lot of talk about the XB-D chips not being that great, I did some more research in the "Binning and Labeling" Doc. on Cree's website . While there are certainly more efficient options, the higher bin XB-D's (group code Q4-R2) can put out up to 112 Lumens/Watt...

Cool, so to get 5000 lumens efficiently you have to spend $88-$114 just for the COB (CD & BD bins Mouser) let alone the heat sink and the driver. Even if you went the cheaper route and got the lower bins from KingBrite, you still have a hefty investment to make for a high efficiency panel using...

Incorrect.... XBD is the "series" of LED chip (i.e. CXA, CXB, XM-L2, Vero 29) Within the series of chips they are then grouped into "bins" which are chips that perform similar to one another. That is why you can have a cheaper CXB3070 for $40 (AB bin on mouser), but a higher bin CXB3070 will...

^^^ I'm not sure these lights were designed with the intention of covering a circular shaped canopy. Most grow spaces I've seen are squared in the corners, i.e. 4x4 tents, basements, bed rooms.. etc. Also, if the par/lux measurements are only adequate in the center beam of the light but degrades...

Taking Ass and Kicking Names

I will be doing this in the coming weeks. Not paying for it, but I will do a 4x4 test with par readings, see what the footprint really is and average ppfd. Hopefully that will put all this speculation to rest. Looking about 3 weeks or so. Btw I think we are getting an SK400+ with the 90 degree...

1.21- so where do we draw the line on speculation? If nobody has a par meter for the HB and a watt meter to calculate efficiency what can we really discuss here? Other than opinions on the creator or opinions on the design. Oh wait.. If you can read a data sheet apparently you know exactly how...

Wow. Now I realized why I never posted in the 7 years I've been a member. I even use CXA's for veg and have 40 veros going to my other side of my flower room, but now I feel like such an outcast and a "shill" whatever that means, that I don't feel very welcome at RIU. Sorry if you don't like the...

I've read through all the hate mail too. This doesn't show that the product doesn't do what it claims. And if anybody Youtube's SK vids from the past 4 weeks, it pretty much disproves the whole hate novel. Can anybody provide a video of seeing the light in person and it not performing?