Importance of 460nm red LEDs?

[Weezard]

Now in understand that these china made lights are not the best on the market but they are far from the only example of lights being redesigned with more and more colors of light. Would you suggest that this is only for marketing reasons? Customers demand more colors so they put them there to sell lights?

(addition talk on the white led) This will give me a much broader spectrum of light. Now I will still have a large amount of 660nm light with a smaller portion of 630nm light. In addition to that I plan on a second stage for my light consisting of UVa and 605-620nm and some deep red. Most likely 30-40 worth total(4watt(uv)30watts(610nm)6-10watts(730ish) that can be switched on around flowering time.

Aloha Greenmain

2 points, for enthusiasm.:thumbsup:
Love to see folks trying things for themselves.

And about multi-band lights?
There seems no need with Cannabis. 2 colors are quite adequate.

Then why hawk 5 band, new, and improved, "super" lights?
It's a crowded market, and most sheeple can be fooled most of the time.
So, if ONE blade gives a clean shave, 5 blade razors must be 5 times mo' betta' Ya?

Same marketing folks that sell us "better" eggs.
(I don't wish to know where they stuff the "extra" vitamins an' minerals so da eggs come out mo' betta.):wtf:

Any road, the fact that 2 colors will grow great bud, is the main advantage of LED growing.
Not gotta pay for generating colors that the plant does not use as efficiently.
(We pay 5X what mainlanders do for electricity.)

So, I no gonna "blind you wit science", no can.
I dunno too much science.
But I do know good buds.:jointsmile::stoned:

A little ~460nm. a bunch of 660nm. and healthy roots will grow buds like the sun. At least fo' me it does.
Can't guarantee your milage, of course, but I could not be happier with my well focussed dichroics.:thumbsup:

Please start a multiband thread and run a side by side with a multi and dichroic. I'll be watching with great interest.

Yer welcome, brah.
Them 2 pennies was burnin' a hole in me jeans anyway.

Aloha Y'all
Weezard

Add: Oops, Sorry Khyber. Posted before I read your last post making the same point.:stoned:
GMTA? Seems obvious, actually.
W.

Weezard Reviewed by Weezard on 05-18-2010. Importance of 460nm red LEDs? Here is something very confusing to me. Many LED proponents loudly proclaim the need for 460-470nm red LEDs over the cheaper 630nm LEDs. I understand that this better coincides with the accepted chlorophyll B absorption peak. So far so good. LEDs veg very well given appropriate wattage & color. So far so good. LEDs do not compare (generally) to HPS flowering as far as yield. (Please - let's not go off in that direction here. Thank you!) Rating: 5

[khyberkitsune]

GMTA, indeed

I'm actually doing a dichroic right now, Weezard, 12/12 from clone, 2:1 460:660, 30w. Link is in my sig.

[vannewb]

Quad-band with trace is all you need for terrestrial plants, and you need hex-band for aquatic plants.

What's your currently preferred bands & ratios?

(I'm guessing from your current 2:1 experiment that you're still trying to find a better mix)

[SupraSPL]

You can use 630nm rather than 660nm and it works no problem. Actually it works better because currently 630nm are available on more efficient chips than the 660s. Once we get our hands on the new high efficiency 660s we will experiment to find the most efficient ratio of 630s:660s.

As far as blue/red ratio, it very much affects stretch. So we use more blue during veg and also the first few weeks of flowering if you are trying to control a sativa dom. Red photons are more efficient at driving photosynthesis and they require significantly less power from the emitters per photon so it is beneficial to use as much red as you can get away with while still controlling stretch.

White light can help some strains ripen on time. White LEDs also have a convenient blue peak at 440-450nm. As an earlier poster mentioned, plants use photons from all the visible wavelengths for photosynthesis, including green. I expect that the small amount of these wavelengths contributed by the white LED is used very efficiently.

Plants may go through some period of adjustment when they are suddenly presented with a light of very different wavelengths. Therefore it may be useful to provide some white even during vegging. Since the white LED provides quite a nice peak of blue, it seems possible that a simple combination of white and red could be very effective. Another bonus would be a more even spread of wavelengths reaching each leaf. I will put that theory to the test as soon as I get the new 660s.

[Weezard]

GMTA, indeed

I'm actually doing a dichroic right now, Weezard, 12/12 from clone, 2:1 460:660, 30w. Link is in my sig.

Aloha Khyber,

I'm subscribed to that thread and follow it closely.
Don't usually poke my nose in unless I have something to add or see a question that I actually KNOW the answer to.

You do jus' fine without unsolicited advice. :greenthumb:

Jus keep pokin'.:weedpoke:
Weeze

[Weezard]

Aloha, Supe


That's why I haunt this board.
Got mo' fact, and less fnord


Got choke folks like you
Tryin' stuff I no can do.


No got the resources to humor my curiosity.


When I started growing, it was about affordable meds.
Now, it's gone from hungry lung to voracious mind.
I jus' have to know how it all works.

The meds are now what limits my quest.
Exceeding 3 Zs per person can turn patients into inmates round here.:wtf:

So, please keep :weedpoke: it and postin' it.
The wilder, the better.
There are no "failures" 'cause it's all information.

Mahalo nui fo' da data.

Weezard