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These are the additional calculations I added to Supra's spreadsheet prior to my last modification where I remove the * 100 in W/Feet². PAR(W)/COB = 50c dissW * 50c % PAR (W) Total = PAR(W)/COB * # COBS PPF = PAR (W) Total * 4.51 PPFD = PPF / Area (Metres²) W/Feet² = ((# COBS * 50C %) / Area...

Aha. My W/Feet² formula is ((# COBS * 50C %) / Area (Feet²)) * 100. You don't multiply by 100. I removed the multiplication. Can't see how anyone would get to 50W/Feet² though. What unit of measure is Heat calculated to? I added a Heat column and this is what I get for 3 * CXB3590 vs 10 *...

How would 2 * CXB3590 in 4.16 Feet² and 5 Feet tall chamber perform compared to the 3 * CXB3070 & 10 * CXB2530? The measurements are 850mm * 450mm, so more rectangular than square. If I was to run 3070 or 2530, then I would have 2 LED bars spaced evenly from front to back, otherwise a single bar...

These are the additional calculations I added to Supra's spreadsheet are in Blue. PAR(W)/COB = 50c dissW * 50c % PAR (W) Total = PAR(W)/COB * # COBS PPF = PAR (W) Total * 4.51 PPFD = PPF / Area (Metres²) W/Feet² = ((# COBS * 50C %) / Area (Feet²)) * 100 Calculations of 1 * CXB3590 for 0.387...

AU$1683 and that's before postage to Australia. That's a bit excessive for 4.165668 Feet² of cabinet. And how would I get a 4 Foot wide light into a 3.38 Foot wide cabinet? Thanks anyway.

I've gone over my formulas and they all seem fine. 1* CXB3590 @ 0.7A is dissipating 22.9W and 1 * CXB2530 @ 0.3A is dissipating 10.2W. So the 3590 is dissipating more than double that used by the 2530. Could that explain the it? I'm not saying you're wrong. On the contrary, I'm the noob and...

Hey Rahz, Just passing on what the numbers are telling me. Refer to the graphic in the previous post. I'm hoping someone can point out my error if there is one before I part with my cash. I'm at the point now where the cheap price of the CXB2530 will more than likely be the determining factor...

That's OK Mark. Sorry for my sharp reply, but you were the 3rd person in this thread telling me I was paying too much, without possibly reading the entire thread, as I keep pointing out to everyone, I'm in Australia. And when the Director of the company selling the COB I'm thinking of...

No probs mate.

http://www.cutter.com.au/proddetail.php?prod=cut2810 No. The price in the www.cutter.com.au link in the line immediately preceding this one clearly states that the CXB3590-000-000N0HCD35G is $66.09. And since I live in Australia, I have to pay the tax, which brings the total to $72.70. Could...

Middle group in the spreadsheet below. 0.7A is somewhere between the 0.5A & 0.8A, and the last column shows 117 & 106 respectively. So a guestimate for 0.7A should be about 110. I simply used the same logic you used in post #38 of this thread, and pretty much got the same figure. You got...

So I see you're the Director of www.cutter.com.au. And you're telling me that I'm paying too much for something you're selling. Well, I've gotta hand it to you. At least you're honest.

Interesting. I see you have www.cutter.com.au in your signature and the CXB3590 prices I'm quoting are from www.cutter.com.au. http://www.cutter.com.au/proddetail.php?prod=cut2810 Care to explain, as I'd be more than happy to pay less.

Well if that's the case, then these are the figures for 4 * 2530 & 5* 2530 respectively which should do the job: Previously we discussed using 10 * CXB2530 @ 0.7A connected in parallel as 2 rows of 5, and the figures now show that 10 * CXB2530 @ 0.7A will produce approximately 110 W/Foot²...

So I walked away and educated myself a bit more and discovered that SupraSPL had uploaded a copy of his spreadsheet, and for a guy like me, that's the Holy Grail. I made some modifications based on what I have learnt here and hopefully discovered all the answers I wanted, only to then find an...

Thanks. Forgot about that site. Questions. How do I know what Tj value to use on the web based calculator you link above, and is Optical Efficiency & Electrical Efficiency OK to be left at 90%? I'm not using lenses so should Optical Efficiency be 100%?

So is the CXB2350 meant to be CXB2530, or is the CXA2530 meant to be CXB2530? I'm looking for CXB2530 data, so this matters to me the distinction is important.

Firstly, thanks for to all concerned in the gathering and making available to RIU this invaluable information. This spreadsheet is the final piece in the puzzle I needed in order to help me understand the ins & outs of LED lighting. However, I think a found a mistake in the spreadsheet. Maybe...

So what determines which driver I use? Why a HLG-185H-C1050 and not a HLG-185H-C1400? And then once I have selected a suitable driver the following calculations will provide the final solution. Dissipation (Watts) = [50C diss W] * # of COBs Gross PAR Watts = Dissipation * 50C% Net PAR Watts =...

So would this be correct for 5 x 3070 AD Bin below? CXB3070 x 5 on one HLG-185H-C1400 = 0.7A per COB 50w x 5 cobs = 250w dissipation 250w x 52.37% efficiency = 130.925 par watts 10% losses from open space, reflectors, walls etc = 117.8325 par watts 117.8325par watts x 4.51 conversion...