Stephenj37826
Well-Known Member
Please take readings at all data points of a 4x4 and post. Even try diffrent mounting hieghts. Really interested in this. Also a video would kick ass lol.
Think ive been led astray
- Thread starter leds420
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KarmaPaymentPlan
Well-Known Member
that's the whole point of using properly binned chips is you can calculate. If the meter readings don't match with what they are promising that's how you know they lie about what they are running.not saying this is the case but that's the point of using top bin Cree so your read outs match the data provided
cdgmoney250
Well-Known Member
I think you have a slight misunderstanding of how "Luminaries" perform compared to the individual LED chips that the Luminaire uses. Depending on the number of chips used, what current they are run at, the spacing between the chips, the thermal characteristics of the fixture itself, and if any optics are used i.e. lenses/reflectors; there can be such a wide range of output. Even the angle of the reflector would play a big part in system performance.
Now you could take data sheet info and then guess and extrapolate the rest of the information... Or you could skip the theorized calculation step and go right to measuring and logging real data. There are a whole lot of claims about watts consumed, efficiency, and performance on this forum that I question unless I saw pictures proving otherwise. It's one thing to work something out on paper, and it's another thing to put it into practice and measure the results.
cdgmoney250
Well-Known Member
We'll have to see about the video, but I will definitely be logging the readings in a 4x4 at the height recommended by SK and probably several other heights. I will post the results once I have it all worked out.
Seeing as for practical purposes this sk unit cannot be used in a 4x4 or 5x5 tent, you have already lost over a third of the height due to the height and the tight beam reflector, it would be better to test this outside of the tent in an open room.
we want to see how the unit performs, not how well the tent performs.
Stephenj37826
Well-Known Member
Yeah just a 4x4 area not in a tent necessarily. I notice they offer a reflector less model now. That should help with mounting hieght some. I'm not bashing just being objective because in the real world 95% of led companies are lieing pieces of shit.
Growmau5
Well-Known Member
Hopefully spectrum king has sufficiently carved a niche for themselves, because winter is coming. Wait, that's not right.. Competition is coming.
Pictured here is a 1000w dissipation LED for large aquariums, it won't be long at all until a spectrum that suits our purposes is added.
Pictured here is a 1000w dissipation LED for large aquariums, it won't be long at all until a spectrum that suits our purposes is added.
Stephenj37826
Well-Known Member
Lol already available on alibaba. Has been comes from same company that the high bays come from. Still not a cxb build though. Watt for watt I think it will hold its own against hps and if you bought it direct the extra cost would work out in quality/bulb change cost eventually.
Stephenj37826
Well-Known Member
SupraSPL
Well-Known Member
Very good info thank you, you would think SK website or user manual would be up to date on something like that. Unfortunately CREE made a rare and unfortunate mistake by advertising the MKR as up to 200lm/W but when you look at the specs it does not. Even the top bin cool white run very soft does not reach near 200lm/W. It is a step up from the XBD, but probably cost SK a more $/PAR W than a Vero would have and the Vero would be higher efficiency as well. But to each their own, maybe they got MKRs at clearance pricing?
Great to see they are using high efficiency top notch drivers. I sure hope there is a very good quality thermal interface between that LED plate and the heatsink surface.
KarmaPaymentPlan
Well-Known Member
ok i agree you could just take the readings it would be faster and more reliable regardless we know what they supposedly use and how many in what size case and the chips they use can only pump out so much optic and other accessories loose light so no matter what it's still not going to perform the same as something with better chips we can butt heads all day but i bet you a lot of these people could make a chart that'd be really similar without measuring the light
HockeyBeard
Well-Known Member
Because, you know, you'll get a good feel on what they're going to do in 30 days.
nothing could be more accurate than real time measurements.
all of the rest is theoretical projection or in the real world a guesstimate. The paper calculated projections become reasonably accurate when they are based on good data, which are in turn based on measurements by someone someplace. Such as digitizing the SPD provided by the manufacturer.
so quit beefing ... nobody trusts SK making realtime measurements the only way to know how the units perform.
Michael Huntherz
Well-Known Member
Haha totally, right?
Yea, but how does the theoretical chart line up with the real measurements, that's the question. We know we can't rely on SK for any of that.
KarmaPaymentPlan
Well-Known Member
but we have Cree to go by c'mon you guys i already agreed that'd it be easier I'm just saying that it's not gonna magically emit more then what the diodes are rated for goodness people
KarmaPaymentPlan
Well-Known Member
again i had already agreed if they use Cree the spd is already available what am i missing? Did you really have to insert yourself in the "beef" just to say what i already agreed?
KarmaPaymentPlan
Well-Known Member
omg keep it up i think he should do it it's just not gonna be anything better then what others can compute it's all theoretical anyways smart ass
what's your problem with me today? My whole point of stepping up and saying something is that Cree doesn't make outlandish claims with the gear what's pieces go in dictates what output comes out
KarmaPaymentPlan
Well-Known Member
look just for @PurpleBuz you think you could let it go now...
Stephenj37826
Well-Known Member
These chips may be a step up from xbd but supraspl is right. They still won't outdo a vero and thats not saying anything about cxb3070-3590.
Stephenj37826
Well-Known Member
If SK is proud of their lights they should post a 3x3 or 4x4 footprint of them. The very fact that they don't should tell you something. I mean really how long does it take to do just that. Hell anything remotely accurate would be good. A center measurement doesn't mean shit. I actually emailed them a couple diffrent times asking for a chart. Let me look I'll give you the response.
"Here is the PAR for the 400+ 90° reflector at those distances.
24" dead center - 850PAR
24" down and 24" off center - 200 PAR
Our 400+ 90° reflector can be kept from 18"-24" from the canopy, sensitive strains like OG like the light 20-24" from the canopy."
"Here is the PAR for the 400+ 90° reflector at those distances.
24" dead center - 850PAR
24" down and 24" off center - 200 PAR
Our 400+ 90° reflector can be kept from 18"-24" from the canopy, sensitive strains like OG like the light 20-24" from the canopy."