3500k And 5000k Mixed On One Fixture

[AvidLerner]

Considering combining 3500K and 5000K on one fixture for a combined veg and bloom light, running both colors through the entire growth phase. what are your thoughts?

 

[Toaster79]

Works great

 

[AvidLerner]

Works great

really? thanks for the quick input. I am looking forward to the new build now more. I am going to use equal 3500K and 5000K along with some Far Red to create more like sunlight effect. peace.

 

[AvidLerner]

Completed the fixture. i will post pics later. it is a four cob passive cooled 200w fixture, with two cxa 5000k, 77v, and two cxb, 36v, 3500k with eight far red led diodes. All driven by one HLGH-186H-C700A driver at 0.7A across the board a 200w fixture that is both good for veg and bloom. peace.

 

[sixstring]

So how did you wire this setup,series?
I did not know you could run 72v and 36v cobs on the same driver so im curious to see how ya did this man.

 

[AvidLerner]

It was easy. I wired the first two cxa in series, and then wired the cxb's in series, as if they were all the same. The driver is constant current, so each cob gets 700mA each driving 50W for each cob equally, with differing voltages. I am going to wire the far red led's in series after the fourth cob, because i still have 60v left, and 8 3.4v diodes will work out just fine. peacer

 

[AvidLerner]

Here it is. off and on, and driver. I did not finish wiring the far red led diodes yet. peace

 

[Toaster79]

Here's my rig

4x CXB3070@2100mA + 2×BRXA25@700mA

CXB 3000K, BRXA 2700K

All together with fans cca. 310W

 

[AvidLerner]

nice.

 

[AvidLerner]

@Toaster79 whats in the mini cab with the fan? a male? peace

 

[Toaster79]

@Toaster79 whats in the mini cab with the fan? a male? peace

Yep

The dad ;)

 

[AvidLerner]

Mounted and running. It seems the 36v cob runs cooler than the 77v cob. Peace

 

[AvidLerner]

So it has been running and the heat sinks are slightly warm to the touch. The 50W passive heat sink seems to work great. no fans just the window draft below it and nice light and cool too. peace.

 

[Evil Monkey]

How's that combined light working for you Avid. I'm looking at a growmau kit on cutter was thinking of combining 3500k and 5000k on a 5 cob set up. I'm really interested in using just one light for veg/bloom. As always love watching y'all tear it up.

 

[AvidLerner]

How's that combined light working for you Avid. I'm looking at a growmau kit on cutter was thinking of combining 3500k and 5000k on a 5 cob set up. I'm really interested in using just one light for veg/bloom. As always love watching y'all tear it up.

works great for veg and bloom. combined color is almost as good as supplemental lighting. peace
Avid

 

[Benniehanas]

works great for veg and bloom. combined color is almost as good as supplemental lighting. peace
Avid

Hey AvidLerner, what did you use for the far red diodes? What color peak are they?

 

[PhatNuggz]

My 2014 BML SPYDR 600 is a blend ~ 85% CW/NW/WW + 5% 450 + 10% 630. works great, htough I woulld like to add more 630 during flower

 

[Buzzer777]

Hey AvidLerner, what did you use for the far red diodes? What color peak are they?

Not avidlearner, but I thought I would chime in..I built this far Red Initiator from RapidLED for about $100..put in a few Violet 420nm for shit and giggles..so far, I like it and so do the plants:)

 

[PhatNuggz]

Not avidlearner, but I thought I would chime in..I built this far Red Initiator from RapidLED for about $100..put in a few Violet 420nm for shit and giggles..so far, I like it and so do the plants:)
View attachment 794199 View attachment 794200 View attachment 794201

Thanks for this. I was not aware of it. Does it require a heatsink, and how did you attach hangers?

 

[Buzzer777]

Yes..heatsink is needed.( For $25..I took their word for it) There are channels in the heatsink..you can use an eyehook, Ubolt, or the like with nuts and washers..I used on hand eyehooks..If you want it fancy..they cell nice hangers for $10 I think. It is very easy to swap out different LEDs if you want to mess around. I think it has had some effect on flowering time, but a few more weeks will tell. These things signal the plant that it is time to begin Photosynthesis NOW..The signal just has to be "seen" according to Gromau5, so intensity is not an issue.