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Old 03-14-2018, 01:26 PM #5081
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Old 03-14-2018, 03:42 PM #5082
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My first flower run with all led has changed my way of thinking
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I was in the saltwater reef hobby for many years and went through the whole HID vs LED debate there. LED work great.

I personally don't think they're worth the added cost in a grow however.

In the aquarium hobby they are great because of the low amount of downward radiated heat. This stops the water from heating up. In a tent or grow room that heat still has to be dealt with. X watts of lighting will still put out X amount of heat.

Today's New CMH lights are almost as cool as LED and have a much better spectrum. Only the plasma lights put out a better spectrum for growing than CMH.

I'm planning to replace all of my 600w HPS with 630w CHM as soon as I can afford.

They are way cheaper than LED and bulbs are longer lasting than HPS or MH.

IMO headroom is the only real benefit to LED in a grow.
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Old 03-14-2018, 04:31 PM #5083
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My first flower run with all led has changed my way of thinking
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Joe what is the general height above your flowers do you try to maintain? The reason I ask is my grow room is height challenged...from flood tray bottom to ceiling is just a little over 7ft. And from the ceiling to the underside of my light is 16”. So right now I have a space of 5’8” under my lights. So with led lights like the hlg550 they are about 4” thick I could gain about a foot of space. Does this sound like enough room to use those led’s?
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Old 03-14-2018, 06:18 PM #5084
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I'm just thinking that with my 200 amp service with the rooms I want to build... the cooling would be so much easyer than a hid to cool... If the weight is there with the led lights most of my concerns are over...
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Old 03-14-2018, 07:09 PM #5085
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I'm just thinking that with my 200 amp service with the rooms I want to build... the cooling would be so much easyer than a hid to cool... If the weight is there with the led lights most of my concerns are over...
Aspen check out this article.

https://growace.com/blog/ceramic-meta...-guide-review/
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Old 03-14-2018, 07:53 PM #5086
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RR that’s why I am running the 315 cmh 3100 k bulbs in my new room. I did look hard at led cobs from timber and HGL but bought the 315 ( pair ) not to mention the cost difference
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Old 03-14-2018, 09:08 PM #5087
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RR that’s why I am running the 315 cmh 3100 k bulbs in my new room. I did look hard at led cobs from timber and HGL but bought the 315 ( pair ) not to mention the cost difference
Yes and the 315's were cooler than the LED.

Also another advantage, if you get remote ballast models you can mount the ballast outside the room for even more heat savings
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Old 03-15-2018, 03:06 AM #5088
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I moved from 8 remote mounted driver LED COBS to 2 remote mounted ballast 315 CMH in my cabinet (plant space roughly 3' x 5").

In that space, the CMH runs about 3-5 degrees warmer than the COBs did, but the quality increase due to the spectrum difference sealed the deal for me.

That said, each of my COBs was the same temp and I think a mix would have performed better. I could have used another 2-4 COBs in there as well.

A third CMH would be insane in there, but they are so cheap I may do it anyway.

Quantum boards may be different animal than COBs though - do they combine different temp chips on the board or are they typically all the same?

Gotta be a game changer if Joe likes em
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Old 03-15-2018, 04:06 PM #5089
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Yes qb's are a different animal. I have a 630 cmh right beside a 9 board light. The side next to o the qb's is noticeably doing better. I'll let ya know when they get further along. Also I don't know about the 315's but the qb's run way cooler than the 630's. Ya can't touch a 630 with your hand
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Old 03-15-2018, 04:23 PM #5090
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Joe what is the general height above your flowers do you try to maintain? The reason I ask is my grow room is height challenged...from flood tray bottom to ceiling is just a little over 7ft. And from the ceiling to the underside of my light is 16”. So right now I have a space of 5’8” under my lights. So with led lights like the hlg550 they are about 4” thick I could gain about a foot of space. Does this sound like enough room to use those led’s?
You do need a few inches above the 550 to move some air and keep the driver cool.
Initially you would want to dim em down and have em about 3' above the plants but you can gradually bump em up and 18" is about as close as you would want but I have had em get to about 10" and started getting top bleaching
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