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Ceramic Metal Halide (CMH)

gardenbug

Member
Ordered from advanced tech but after a week the tracking info says it still hasn't shipped. Either tracking isn't updating or they are really slow to ship. Think I saw a few other posts about them being slow. The price is good and is supposed to come with a free hps bulb as well, but I can't really recommend them at this point.
 

Baba Ku

Active member
Veteran
It may not be what you want to hear, but I suggest being patient. It's a one man show, and things can get a bit hairy at times with a small operation. I have seen him be very slow in both shipping product and answering back. But I have also seen him deliver in very fast time.
Never have I seen a report of a non-delivery screwing.

Maybe he is out of stock and awaiting a shipment himself? Or perhaps he hasn't finished testing the bulbs...which he does with each on of them to be certain you don't have to find out the hard way that it won't fire. He says that a percentage of them don't fire right from the factory.
I'd give it some time. His responding to you so you feel all comfy only takes things longer.
Maybe he has 20 people wanting tracking numbers and such...which if you have ever been involved with any internet sales, you will find the people can be complete assholes. Especially American youth.
 
sending a tip is always a good way to expedite shipping. I received mine within two weeks of mailing the payment. free hps too. well spent eleven dollars.
I'll post some pic soon. its bagseed, the light is damn near 2 ft above the tops and the internode length is maybe, MAYBE a half inch. Maybe my standards are low or i suck at growing but i'm impressed.
 

gardenbug

Member
It may not be what you want to hear, but I suggest being patient. It's a one man show, and things can get a bit hairy at times with a small operation.

I figured it was an actual electrical supplier or something, if it's just one guy then being slow makes sense.
 

Ty_Kaycha

Member
...you will find the people can be complete assholes. Especially American youth.

Well that was uncalled for.

I've found that there are assholes worldwide, just as many in America as there are in India, though maybe more in China as they have the most people. :tiphat:
 

huntingbb

Member
hey it appears i forgot to update this thread for my round one.

Quick rundown:



09.18.2010 right side of closet



09.18.2010 middle-> rightish side of closet - little bit of ak, and a shitload of blackberry



09.18.2010 left side of closet - 8 2gal plants


09.17.2010 What's left... and the new run!


09.17.2010 harvest to date


09.17.2010 nice looking girl from today's harvest


09.17.2010 plant from 2gal i harvested early


7.27.2010 10 days into flowering - just 400w (cmh)


8.27.2010 40 days into flowering - 175w (hps) up with the 400w (cmh)


09.06.2010 50 days into flowering - swapped in second 400 (hps) for the 175w (hps)


09.05.2010 my nutes

Gave my local shop bit over 5oz, total harvest between 8-9 I think, did not weigh the total amount, and ive some trim in the freezer for when i get bags.

I had temp and ph issues, as well as nute burn, and did forget to water too long once or twice. Also there's TONZ of leaves with this, even with some defoliating. Good luck on your runs, i'm using the 400cmh for my veg in the future :wave:
 

Pyrosin

Member
anybody know an assembled hps ballast that works well with the cmh? i am looking for a 250w ballast and ive been looking around but all i found are the kits which i do not want. i want a remote ballast in a case all together not the ignitor, cap and, ballast seperate. i can find 400w ballasts easy not a 250 though.
 
B

blueberry dank

To everybody who can help..Iv read that CMH bubls run alot cooler than normal HPS bulbs..is this true?..if so,by how much?

Can I run 2 CMH bulbs without a A.C hood in a smallish closet?...as long as I have enough exhaust and intake?...

Basically..do these things really need a air cooled hood or not? Thanks
 

messn'n'gommin'

ember
Veteran
It is my understanding that they run slightly cooler. I couldn't tell you by how much, but, I don't think it is all that much cooler.

I'm running two 250's with batwing style reflectors in a 2x4 closet. A/C hoods in a closed circuit will allow your closet to run cooler and to get the light closer to your plants, but, is no more (or less) necessary than with HPS lamps.
 

Ty_Kaycha

Member
To everybody who can help..Iv read that CMH bubls run alot cooler than normal HPS bulbs..is this true?..if so,by how much?

Can I run 2 CMH bulbs without a A.C hood in a smallish closet?...as long as I have enough exhaust and intake?...

Basically..do these things really need a air cooled hood or not? Thanks

What size bulbs?
 

StealthDragon

Recovering UO addict.
Veteran
.Iv read that CMH bubls run alot cooler than normal HPS bulbs..is this true?..if so,by how much?

At one point I switched from a 400w hps to cmh and temps dropped about 3-4 degrees...from about 82 to 78...ambient at about 70, using just a cooltube and a cheapo 6" booster fan.
 

Baba Ku

Active member
Veteran
I see the same thing in a cab grow as you, StealthDragon.

I don't have stats or anything, but I would bet that the temps reached in the salts of both HPS and CMH are similar if not identical. I think the difference is how the energy of each bulb is dissipated. The light/energy created by each is a bit different from one another, and effects how each is radiated. This difference in radiation is what effects the ambient temps near the lamps.
 

scurred

Member
To everybody who can help..Iv read that CMH bubls run alot cooler than normal HPS bulbs..is this true?..if so,by how much?

Can I run 2 CMH bulbs without a A.C hood in a smallish closet?...as long as I have enough exhaust and intake?...

Basically..do these things really need a air cooled hood or not? Thanks

They don't really run cooler, they just don't throw as much radiant heat onto your plants, the heat tends to stay in the reflector - closer to the bulb.

You never really NEED a air cooled reflector, the only time you would need this is if you wanted to get your light within 6" of your plant tops, or wanted to run a sealed room with co2.

As long as you have an exhaust fan and enough passive or active intake, your closet will stay cool. Just run the exhaust at all times when your light is on.
 

gumball

New member
hello all. been lurking for some time. i have a 100watt 4000k mastercolor bulb currently running in a PC case. i am going to build a cabinet just for flower, and use my PC for a mom or 2 and clones. my question is this, should i get another 4000k mastercolor CMH for flower cab, so same bulb in each space, a 3000k mastercolor CMH for the lower kelvin temp, or an HPS bulb for flower? i know, y'all probably dont like to hear about HPS. but i have read quite a bit on how they help bulk the buds up. i appreciate any feedback y'all can provide, thanks!

Someone repped me on this post (thank you by the way) and said not to get the 3000k because it was rated for an enclosed fixture and therefore dangerous. Well isn't the recommended 4000k rated for an enclosed fixture, or really all the NON-coated bulbs are enclosed fixture rated, right? I have the 100 watt 4000k NON-coated CMH ed-17 running in a PC case now. It isn't exactly enclosed, but I do have a heat shield made of duraplex. I want the 3000k so I can add some color, this racist 4000k bulb is just to white for me, J/K :).

Again, just curious if the repper had more reasoning. I understand it may be dangerous, but the bulbs are sold to the general public, so they can't be THAT dangerous.

By the way, I have decided to by the extra bulb in the 3000k color. I mean all the guys in the UK that run CMH run the 3000k, so they work for their intended purpose.
 

gumball

New member
Exactly, so what makes the 3k more dangerous, anything specifically? Using these HID lights in some of the places we use them makes them inherently more dangerous than they were designed. But so far the grows that I have seen using these were successful, so I think its worth the $40 for the added color.
 
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