Lighting .How much is too much?

[NastyN8t]

I'm planning on switching out a 1000w hps for 20 1212's + 6 cxa3050's x 1100 watts in a 4ftx8ftx7ft hi....

Here's part of my conundrum, I have 2 x 3ft liquid cooled heatsinks that have 6 good cxa3050s epoxied on one and the other will be stripped of burnt up China cobs. I have materials to build 2 more light bars at 3ft long (will do a diy instructable thread). This will give me a total of 26cobs in a 4x8 . I have 1 400w@ 36v China power supply and 2 mean well lrs-350-36 350w @36v power supply's bringing it up to 1100w of power. I planned on running each of the 1212's @50w . That works out to 7 1212's per 350w driver and 8 on the China 400w ...... I can't remove the existing Cree cobs w out destroying them and I need 2 of them to balance the power on the 400w.....
So I'll have 4 cobs as spares in place or I could light them up ?

Is this too much? Any of this make sense?



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[BigSm0]

I would t run that many if they were free and my electric bill was free too. People say you can run at 50-60% of hps wattage in cobs for similar results. I personally think it's possible to do it at much less. More like 1/3 the wattage. For a 4x8 I would do 10 cobs max for a total of 500watts

 

[NastyN8t]

When I first got into DIY Cobbs the 3070s were the best to get and most of us were shooting for about 25 watts per square foot.... They were obviously a little less efficient so that put my target closer to 400 watts per 4x 4

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[NastyN8t]

I know that should put me closer to 800 watts for a 4x8.....I'd normally run 600-1000w hps for each 4x4

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[BigSm0]

This with photo period though? 12/12 for photos vs 18/6 or 20/4 with autos makes a big difference. Check out DLI on google.

 

[NastyN8t]

Maybe I'll try 700w split between the 20 1212's .......

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[NastyN8t]

I appreciate the input, I'm the kinda guy that rides the edge of badass and disaster , so Overkill is like second nature to me

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[BigSm0]

I'm with you. I had 2 kind k5's and 2 mars 600's in a 6x6 space once. Now I have 450watts over each 4x4 and see consistent light stress and doing another grow with 200watts in a 4x4 with my best growth yet with 6 foot tall autos that are completely full of bud. Adding up the extended light hours on autos compared to higher wattage lower hours of photos equals out.

 

[NastyN8t]

Another issue is that this is all at a friend's house that is a med patient and has a level payment plan on his power bill....He is adamant on keepingthe bill at the same level not less, lol!!

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[NastyN8t]

Hps throws too much heat and is a shit spread centered in the tent. I battled premi seeds from heat stress all last summer......Hence the pending conversion ......

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