they do offer a 4200.
the website is messed up and the link to that bulb is broben on the products page
go to the page as if you were buying a 630 DE fixture and you can see all 3 bulb (tube?) options in the drop down menu.
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Philips 315w CDM Elite (CMH)
- Thread starter rives
- Start date
the website is messed up and the link to that bulb is broben on the products page
go to the page as if you were buying a 630 DE fixture and you can see all 3 bulb (tube?) options in the drop down menu.
Miraculous Meds
Well-known member
Its just hours with flowers buddy.
The 6x6 is 80"x80"x80".
the 8x8 is 96"x96"x86".
I can zip tie the phantom hoods to the tent pole ceiling, as they weigh very little, and have virtually no heat build up on the top of the hood.
the sun systems weigh about 50lbs and I was concerned with them being too heavy. So I mounted them to the steal beams above the tent. So I can get the hoods within an inch of the tent ceiling. Its the best I could to with my space and growing large plants for reduced plant count. If I were able to grow 9 plants per light, height wouldn't be an issue with scrogging in this low ceiling situation.
I confess to being a lazy grower. That's also why I love blumats & organic soil. Once I get the girls into their flowering pots I barely have to pay attention until harvest. I also enjoy seeing the natural form of different strains, so I just let 'em grow. I get plenty for the purposes of family & friends that way, which is the only reason I do it. Other people have different purposes, of course, so yield matters more. I discovered that letting 'em get taller before flowering doesn't really increase yield with my system because shaded lower branches can't get enough light to produce much more than larf. Keeping the veg cycle at 5 weeks from seed seems to yield as much as going longer with it. Just sayin'- you know, for what it's worth.
It was missing from the 630 bulb page when I looked. He must have seen my post and fixed it. Its up and working if any want to buy those bulbs.
hah, your tents look much like mine right now!
and 3 days ago i just raised the lights as high as they can go onto the frame of the tent i'm using... i'm about 14 inches from the tops of plants and the tip of the bulb using this reflector: https://www.sunlightsupply.com/shop/product/sun-system-lec-brand-315-ra-remote-reflector_52_000010
i'm hoping 14 inches is enough!
this is really my 1st time growin in a tent , 4x3.5ft with height under
6' , '2' 315cmh's, 4plants, 2 weeks into 12/12- i'm keeping the lights about 18'' above the tops, with a fan blowing over the tops , trying to keep the temp down, so far so good as its ranging in low/mid 70's with lights on- i too notice lower 1/3 of plant not getting much light... what about trimming the bottom 1/3... all it yields is popcorn- let the plant put its energies into the tops... what you guys think???
ps.. i only have another 18'' b4 i run out of height...
take out all the bottom branches that don't get light.
Always worth it!
thanks... trimming now....
Miraculous Meds
Well-known member
I think you will be fine. Your reflectors are similar to mine. theres a hot spot directly under the bulb. If you can keep your plants a little lower right there, you should get by with little to no light stress.
How many lights are you running, in what size space?
heres the 8'x8' after the initial tie down. I have some spreading out to do still but they are set at least.
I started with a SS monster LEC hood. It wasn't the air cooled version. It was built like a tank. These weighed a ton not good for tent use.. I hated the mirror finish..It was a PITA to clean without damaging it. within a year It started to oxidize.
toastyghostie
Member
I keep hearing about the impressive UV output of cmh. I was looking at a spectral analysis of everyone's favorite bulb and
https://www.cycloptics.com/sites/default/files/USU_spectral_analysis.pdf
The uv output is way lower than conventional MH even lower than t5 and quartz halogen. I guess that's the UV-BLOCK / safety jackets fault? The performance is great regardless good to know you don't need to worry about working under them all the time
https://www.cycloptics.com/sites/default/files/USU_spectral_analysis.pdf
The uv output is way lower than conventional MH even lower than t5 and quartz halogen. I guess that's the UV-BLOCK / safety jackets fault? The performance is great regardless good to know you don't need to worry about working under them all the time
If u want more uv output use 3100-r. These are what I use with 4200.. ..
The 3K-R is an enhanced version of our 3K Lamp that is designed specifically for plants that are prized for their resin production. It is similar to the original 3K, but it has contains a few subtle differences:
The 3K-R is an enhanced version of our 3K Lamp that is designed specifically for plants that are prized for their resin production. It is similar to the original 3K, but it has contains a few subtle differences:
- A slight increase in UV light to promote resin production
- A taller peak in the Far-red to stimulate metabolic activity during flowering
- Slightly higher PAR for better flower density
- Increased intensity in red
Meh. Low UV is a feature, not a bug. There's certainly no lack of resin in anything I've grown under 3100 philips lamps. Meanwhile it's easier on the eyes, quite by design, and reduces oxidation on all surfaces in the area.
Outdoor oxidation from high UV at high altitude is a real issue here in CO. Lots of paints & plastics don't stand up to it well.
Some of it is about glass absorbing the UV & turning it into convective heat but it's mostly about the blend of halides in the arc tube. The production of high energy UV photons decreases the production of PAR photons at any given power input so Philips engineers away from that.
Outdoor oxidation from high UV at high altitude is a real issue here in CO. Lots of paints & plastics don't stand up to it well.
Some of it is about glass absorbing the UV & turning it into convective heat but it's mostly about the blend of halides in the arc tube. The production of high energy UV photons decreases the production of PAR photons at any given power input so Philips engineers away from that.
The people you are hearing about high UV output from CMH are simply wrong.
CMH was designed to be an HID that provides the spectrum closest to natural sunlight for use in spaces that people inhabit. High UV is undesirable in that application.
The UV output from the old 400w CMH bulbs might be higher. I cant find any specs on these older 400w mogul bulbs.. The new CMH bulbs have low UV.
https://www.htgsupply.com/products/ge-400-watt-ceramic-light-bulb-cmh-lamp
https://www.htgsupply.com/products/ge-400-watt-ceramic-light-bulb-cmh-lamp
toastyghostie
Member
I was just saying it must be the t-12 package with the extra jacket (labelled uv-block on my bulbs) that cuts the uv. Maybe the 630w de's and t9's produce some uv I can't find a comparable analysis.
Good info jhhnn I'm not complaining about it I've had great results with these bulbs I was just under the impression that UV was responsible.
Good info jhhnn I'm not complaining about it I've had great results with these bulbs I was just under the impression that UV was responsible.
DE bulbs do not have any UV block labeling. These need to have shields put on so im sure it lowers the UV.
Thanks Toasty and Hammerhead.
I had not considered possible UV block coating on the glass of the second jacket of some 315s.
My understanding is that the secondary "lamp shield" for DE bulbs is clear borosilicate glass like a cool tube.
Dunno about HPS, but UV blocking outer envelopes are a common feature of all MH lamps intended for lighting. The excited gasses in the arc tube will emit some UV no matter how well engineers manage to reduce it. That's why it's important that the outer envelope be intact at all times.
Dunno for sure, but I'm confident that the UV output of DE lamps is well within the safe range. That's a basic consideration of lighting engineers.
There are a lot of myths & misconceptions in the realm of cannabis. I really think that regarding UV as beneficial is one of them.
Dunno for sure, but I'm confident that the UV output of DE lamps is well within the safe range. That's a basic consideration of lighting engineers.
There are a lot of myths & misconceptions in the realm of cannabis. I really think that regarding UV as beneficial is one of them.
