Greengenes707
Well-Known Member
Ya, more 3070 BB's coming march 9th(~$32.5 with DIY10 code)...cxb3590's CD's should be up tomorrow night(~$43 with DIY10 code).
Mau5Capades: builds & grow journal
- Thread starter Growmau5
- Start date
Airwalker16
Well-Known Member
Do you sell BJBs for the 3590s?
Jmancuso9763
New Member
word thanks
Growmau5
Well-Known Member
UPDATES:
current grow: 32 cxb3590 @700ma. second harvest happening now , pics, weight, observations, etc to follow
mau5 diy kits. Mark over at Cutter.com.au is working diligently and doing all the heavy lifting on this. Predrilled, pretapped, black anodized heatsinks pin heatsinks will hit cutter in approx 2 weeks. They will be drilled and tapped for multiple different COBs. more details to follow.
new grow room: My lease here expires in 90 days, I just broke ground on the site of my new "ground up" grow room. Not much to talk about or show right now, but I will be posting media as it becomes available. I may even start a new thread just for this build, because I believe it could be a nice resource for others that share the same dream.
please bare with me over the next 90 days, I haven't forgotten about RIU, there are just some days I come home so dirty and tired that the computer doesn't even get switched on.
current grow: 32 cxb3590 @700ma. second harvest happening now , pics, weight, observations, etc to follow
mau5 diy kits. Mark over at Cutter.com.au is working diligently and doing all the heavy lifting on this. Predrilled, pretapped, black anodized heatsinks pin heatsinks will hit cutter in approx 2 weeks. They will be drilled and tapped for multiple different COBs. more details to follow.
new grow room: My lease here expires in 90 days, I just broke ground on the site of my new "ground up" grow room. Not much to talk about or show right now, but I will be posting media as it becomes available. I may even start a new thread just for this build, because I believe it could be a nice resource for others that share the same dream.
please bare with me over the next 90 days, I haven't forgotten about RIU, there are just some days I come home so dirty and tired that the computer doesn't even get switched on.
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Fastslappy
Well-Known Member
Carry on Bro !
Y've done alot already , take of #1 we know y'll be back when you can .
Y've done alot already , take of #1 we know y'll be back when you can .
robincnn
Well-Known Member
I like the hole in cutters heatsink to route wire. Looks like it will work for 3070, vero 29 and 3590. Vero 29 in datasheet looks like 43mm diameter for screw point. Cutters design seems to have 42mm. May be 42 works fine as well.
Tapping holes in heatsink can be a pain. I have been working on a heatsink kit but without cobs. 140mm diameter for now and may be a 120mm in future. Details on my web here
If cutter can make a great kit and great shipping price then good for everyone. Saves me time too
These heatsinks work great for passive cooling and weigh much less than long flat extruded profiles
Tapping holes in heatsink can be a pain. I have been working on a heatsink kit but without cobs. 140mm diameter for now and may be a 120mm in future. Details on my web here
If cutter can make a great kit and great shipping price then good for everyone. Saves me time too
These heatsinks work great for passive cooling and weigh much less than long flat extruded profiles
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BobCajun
Well-Known Member
I found something that may interest GM5 or GGs.
"Photosynthesis can be increased up to 400% by means of intermittent light. The researchers used a rotating disk with a cut-out section to chop the light from a lamp. They found that 75% of the light from a given source could be blocked without decreasing the rate of photosynthesis. The improved yields produced by intermittent light depends on the frequency of the flashing. A frequency of 4 flashes/minute resulted in 100% increased yields. The amount of work done by the light can be increased by shortening both the light and dark periods. For example, yields can be increased 100% by using 133 flashes/second. Emerson and Williams improved the yield (compared to continuous light) by 400% by using only 50 flashes/second. The light flashes must be much shorter than the dark period. The minimum dark period is about 0.03 at 25 o C. The light reaction begins with about 0.001 second/flash, and it depends on the concentration of carbon dioxide. " source
So how hard would it be to rig a dimmer type circuit to make LEDs pulse at say 50 times a second? You would increase yield and save power at the same time, assuming the article isn't pure BS. Doubt it would increase by 400% but something like 25% would still be nice. This would only be practical to do with LEDs of course.
I read somewhere else that higher amounts of pulsing, in the thousands, actually reduces plant growth, so those dimmers that work by flickering the LEDs may actually be bad, depending on the flicker rate.
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Growmau5
Well-Known Member
thats pretty interesting stuff. Im sure an arduino could do this with a custom PWM signal.(Bit-banging pwm sig)
https://www.arduino.cc/en/Tutorial/SecretsOfArduinoPWM
bicit
Well-Known Member
@stardustsailor was working with this idea about a year or so ago. I wonder if he had any promising results from the experiment.
BobCajun
Well-Known Member
If it actually works it would revolutionize indoor growing, by cutting power usage by 75%, or whatever it turns out to be. That's pretty significant, wouldn't you say? I guess nobody actually did this before because all they had was HID and fluorescent at the time, and the pulsing was really just blocking the light, rather than actually turning it off, so there was no power savings.
Greengenes707
Well-Known Member
So essentially PWM dimming. Not meanwell and others use of a PWM signal to dim CC...but true PWM, pulse width modulating of the DC output. It could be done on a set frequency, the dark time being longer was interesting.
I believe SDS was working on an automatic gradual full power-dimmed, not a quick repeated one.
I believe SDS was working on an automatic gradual full power-dimmed, not a quick repeated one.
bicit
Well-Known Member
I believe it went from 100-50-100% dimming over an hour or half hour. Definitely not as quickly as in the paper linked by bob nor does it go to full darkness. However I do believe SDS referenced the same paper, or one similar too, it seems really familiar.
Something to look into anyhow. Off to google to see how such a circuit could be built.
@Greengenes707 just an off couple of questions. For this idea would we need a driver capable of true PWM dimming from the get go? Or could I wire an external circuit to the DC side of a normal CC driver? Do you think it would effect the life of the driver at all?
I Hypothesize that this effect is significant when using high intensity light near saturation levels.
what I mean is that the grow area has more than enough light (note how it depends on CO2 concentration)
and that the pulses have enough intensity to carry over.
could probably do a similar effect with a light mover.
bicit
Well-Known Member
Well according to the paper the light flashes must be shorter than the dark period. Implying to me at least that there needs to be periods of total absence of light, not just reduced output. IE making it impossible to simulate the effects using a light mover or through the dimming wires of a meanwell B type driver.
I don't expect a light mover to duplicate the precise strobing effect they created. A light mover just being another way of deploying a near saturation level of light, but over a wider area.
I think the effect they have found, is the same as reducing overall intensity.