Mixing colorspectrum samsung diodes.

Hi, I want to customize two 1000w fixtures and my Idea is to mix
3000k lm301h evo chips with
5000k lm301b chips
with added 660 and some 730nm.

but what ratio between 3k and 5k is ideal? how many % of white led should be at what kelvin?
Would appreciate any input! I want to flower under this fixture mainly, I dont care about veg specific spectrum!

Thanks

50-50 3k to 5k is exactly the same as 100% 4k

@Rocket Soul , any concensus on the subject?
I know it's been discussed many times

coreywebster said:

50-50 3k to 5k is exactly the same as 100% 4k

@Rocket Soul , any concensus on the subject?
I know it's been discussed many times

Click to expand...

As far as i know youre correct but might be a bit different if using different make diodes.
This is based on some tests posted long time ago from hlg: 4k and 3k 50-50 results in exact 3500k.

I think the reason we see 5k/3k mix is for fabrication/comercial purposes: if you buy 5k and 3k as a company you can then make something closer to 5k or 3k by mixing proportions. If you go straight for 4k you cant play with the spectrum in the same way.
But there is no extension of spectrum, or "5k for veg/3k for flower" validity; the plant cant chose which light hits its leaves for obvious reasons.


Though reading back to OPS post, its evos veraus regs: id probably go for something with a bit more 3k evo than 5k regs to equalize the blue peaks, maybe around 60-40 to 70-30.

But at the same time id say that if i were making a custom spectrum id probably use different whites, im not super happy with how approx 4k + reds grow to be honest. Buds get nice and dense but not the same flavours as otger of my lights.

So thank you for quick reply and I guess it has been discussed somewhere many times, appreciate your input anyway!

I will ask to make
60%-EVO3000k and
40%-5000k301b
225whites (100x5000k+125x3000k), 40x660nm, 23x730nm

But @Rocket Soul What other lights produce better flavours? I have the possibility to play with the ratio of leds. maybe I sould go 75%301h and 25%5000k? I heads a student from Utah university stating that light intensity is more important than spectrum, thats why I was thinking 50%/50% was a "sweet spot" so to say.

What would be a good ratio if using lm281b+pro and 3000k+6500k spec. 60/40 or even more 3000k? is the difference in photons between 3k and 6.5k that much?

Some Fixtures on ali are selling green diodes in a 36% and 23% ratio(red and blue are free variable). they call it nasa science...

propaganja68 said:

So thank you for quick reply and I guess it has been discussed somewhere many times, appreciate your input anyway!

I will ask to make
60%-EVO3000k and
40%-5000k301b
225whites (100x5000k+125x3000k), 40x660nm, 23x730nm

But @Rocket Soul What other lights produce better flavours? I have the possibility to play with the ratio of leds. maybe I sould go 75%301h and 25%5000k? I heads a student from Utah university stating that light intensity is more important than spectrum, thats why I was thinking 50%/50% was a "sweet spot" so to say.

Click to expand...

Im not sure what to say cause my advice would go a little bit against what most people would advice. Yes, for yield efficiency or better said light intensity is more important but the differences in efficiency are quite small, i prefer to just add a little extra wattage to get the intensity and spectrum i like.
Id go for 2700k 90cri + 660 + 400nm personally for flower.

My general sort of reasoning is that low green, high red and wide blue (as in throwing some near uv or violet in there) is better for quality, and the more green you add the better yield and density but with a slight loss in flavours.

The ratios you quote above: i dont have direct experience of growing with evos so i cant say a 100% but the numbers you quote seems ok to me.