New style Samsung LM561C Board

DankaDank

DankaDank

Well-Known Member
Schalalala said:
A 100% effective CRI 80 3000K LED would give you around 330 lm (=LER). Therefore the efficacy is already 220lm/330lm = 0,66 = 66 %.
Blue LEDs with an efficacy of 75 % are already available, I suppose top bin deep reds are around that as well.
So yes, blue and red will outperform white LEDs with regard of efficacy and PPF. Practically the photon flux per dollar ratio is a lot worse than with whites, that's most people choose white LEDs.
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It's nice to stimulate accessory pigments with white light as well. Not to mention green is also useful.
 
PhenoMenal

PhenoMenal

Well-Known Member
i got a "HS1010" light meter in the post today. It can detect up to 200000 lux. I used a ruler with each measure. Purported accuracy is +/- 5%, so a reading of 50000 lux should be 47500-52500. Good enough for this amateur gig.
Code: 
11500 FC, 123800 lux             = highest read from my 2xQB-304 (meter close)
11090 FC, 119400 lux             = 3pm summer sun but with some cloud cover
 6980 FC,  75200 lux, 376 lux/wt = 12" from 200w 2xQB-304 (3000K)
 4670 FC,  50300 lux, 167 lux/wt = 12" from 300w Viparspectra
 3660 FC,  39400 lux,  99 lux/wt = 12" from 400w Mars II, disappointing
  227 FC,   2450 lux,  76 lux/wt = 12" from 32w Philips fluoro ring ceiling bulb
so, to get the same total lux @ 12" as I'm getting from the 2xQB-304 (~200w) i would need either:
  • 1.49 x Viparspectras (448 wt)
  • 1.9 x Mars II's (763 wt)
  • 30.6 x Philips lightbulbs (982 wt).
Sammy LM561C - Putting the effin in efficient.

I also tried to see how much sunshine comes out of my ass as that is the only other thing it's useful for, but it's too tricky because i have to bring it into the light to read the display. Will keep trying. #science

So I've just gone from 400w (Mars II) outputting 40000 lux @ 12" to a 200w QB outputting 75000 lux. I mean ... hell yeah.

Anyway back later, i can hardly see a fricken thing. Only Trump should stare into the sun kids
 
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S

Skiball

Well-Known Member
PhenoMenal said:
random Q - do these new super-efficient white LEDs like the LM561C's spell the end to the blue&red LED boxes we've been used to?

The theoretical physical limit for the phosphorus white LEDs is 260-300 lumens/watt, and they're already at 200 with LM561C, and now at 220 with LM301B which is slowly starting to appear for sale. Could the blue&red LED boxes go the way of Blockbuster VHS tapes? or could certain configs of blue&red outperform white LEDs? ♥Science
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I'm no expert in anyway but imo no. Look up osram ssl120, single nm diodes are coming a long way too. It really comes down to you're opinion on what's more accurate the mcree curve or par. I haven't been able to find many reads on comparison of the two. I think we'll eventually see more lights like chilled. With an even larger amount of single nm diodes then what they use. The lighting market is just that a market. Like every other market they're out to make money first. Anytime something new is available you'll see trends even if it's unfounded. It's common even in the medical field obviously no market is immune.
 
E

estooki

Member
Long thread, but a great read. Learned a lot from you guys.

Has anyone tried these ebay QB288's? ebay com/itm/192434587761

I'm thinking of ordering a pair to test out, but I'm not sure if the risk is worth the cost savings.

Edit: Gonna take the chance. I have a quantum sensor coming too, I'll post up results when I receive them.
 
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PhenoMenal

PhenoMenal

Well-Known Member
estooki said:
Potato, potahto
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TOMATO mate :)

i hope your sensor is a PAR meter, that'd be sweet!!! :) my cheapy "HS1010" meter could only measure LUX, but im glad i bought it, i LOVE EXPERIMENTS and it was beautifully fascinating to compare my different lights with it

ps. the spectrum of the Samsung diodes suggest theyre 95+% within PAR range? (400 to 700 nm)

Moflow said:
A Spud gun
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BYO salt!? i feel we should provide that nice flavoured salt like KFC etc ... (PRO TIP: always ask for the free "extra salt sachets" whenever ordering! ♥)
 
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chuckduck

chuckduck

Well-Known Member
It's been a couple weeks. Paging @CobKits Paging @CobKits .
Anything to report on these?
I'm going to update my original post with a summary of everything we've learned in this thread. Gonna throw in some pics of my two lights setup in the tent. Going to post a pic of the different diodes to compare so people can see what they are getting. Going to add par numbers for both lights. Would like to add Cobs impression of these boards on the original post too.
 
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