Ceramic Metal Halide (CMH)

[smokesalot420]

Yeah, what Wastekan said! I get hot and sweat more when I'm working near my lights (no hoods/reflectors on the CMH's) even when the temp isn't above 76 degree's so I think so....

I always try to wear my sunglasses when I'm working near my tent

 

[messn'n'gommin']

If you look at the SPD on the first page you can see that everything after 400nm is cut off. But, I don't think it a bad idea to extrapolate to a certain extent. So, without knowing for certain, I would say that it does give off some UV-A in the upper reaches (great for taste and aroma!), but I also feel that it is a bit of a stretch to say it gives off any UV-B. But, like I said, I don't know that for certain.

Namaste, mess

 

[Pinball Wizard]

I had two white widow plants flowering under a 400 CMH. I always rotated the pots, 1/4 turn, every 24 hours when the lights came on. This only took about two minutes per day.

About half way though the grow...I noticed a dark, burning look on my right hand knuckles? I never gave it much thought; but switched to using my left hand, instead. In about a week, I noticed the same thing on my left hand knuckles. Since the skin on a person's knuckles is about as thin as it gets?...I would have to assume the CMH bulb is throwing down some serious UV rays....and I know, that not all reflectors are created equal.

I don't know what you can do with this information?...but, there it is...

 

[TroubleGuy]

The UV-B given off by CMH bulbs is said to be equivalent to the amount of UV-B you'd be exposed to at high noon on the equator.

If that's true, and I have no proof that it is, I'm just sharing what I've heard & read several times, sunscreen and glasses = good idea.

I guess the benefit of using a UV-B reptile lamp is that you can turn it off before you enter your growroom. CMH doesn't give that option.

 

[asde]

the uv waves emitted by cmh are only dangerous if you watch directly at the bulb or when the outer bulb is broken
but using sunglasses when entering the room is recommended because your going to watch at the bulb anyways

 

[Wacky Tobacky]

well i have mine in a tent and im never really directly under it. i put my hand close up to the hood to check the heat. i havent gotten any burns or anything. i didnt know it was dangerous........ lol

 

[outdoe]

lets see yours then....

what the hell did you dump saurkrout on that bud. Good Pic T

 

[FreezerBoy]

well i have mine in a tent and im never really directly under it. i put my hand close up to the hood to check the heat. i havent gotten any burns or anything. i didnt know it was dangerous........ lol

Well, no plastic caps for me anymore. Being in a cab, sometimes my clearance is in inches when I stick my head in.

I never felt a thing but found a big wad of melted plastic on the lamp. Had to shave it off with an X-acto blade.

 

[asde]

yo feeezer boy, what happened to you has nothing to do with uv waves but it shows how dangerous it can be to enter an grow room when your high

 

[wastekan]

OMG no... never wear petro-chemicals on your head.. time to upgrade http://www.fairhemp.com/Products/Headwear

 

[FreezerBoy]

I need one with ear flaps. If it's no good for your scalp, it can't be good for ear tips. I use a cotton dish towel under a cotton cap for that French Foreign Legion look.

 

[Wacky Tobacky]

Well, no plastic caps for me anymore. Being in a cab, sometimes my clearance is in inches when I stick my head in.

I never felt a thing but found a big wad of melted plastic on the lamp. Had to shave it off with an X-acto blade.

lol did it burn your hair too?

good thing i got mine in an air cooled hood with glass. i hit my head on the glass a few times lol

 

[FreezerBoy]

Hair? I remember that word. What does it mean?

Seriously though, I have no hair in that area. That's why I was so surprised to see the hole. You'd think I'd fell something.

 

[simba]

supers all,

as far as the UVB output from CMH all CMH put out UVA, UVB, UVC,
How much at each range is not Public released by philips or any other Direct MFR..
Not because its bad or super high.

and some cmh have UV Coatings to stop the UV from coming threw or at least minimizing at distance (like 8+feet)..
Adv Tech Has the UV outputs for all lamps but wont give them out..yet...not because they are bad rather they are waiting till they have 3rd party confirmation of there results.

I am under 20-4,000 Watts of CMH every day under many different model cmh lamps.
in my shed i have 800 watts CMH as work lights and i am out there allot with no Ill affects from CMH full SPD or UV rays..
I will say if u dont go out allot ya u might get a reaction.. (dont get allot of real sun)

i will say without the bulb getting air cooling By either a fan just blowing across it or air cooled hood they do get toasty but not as toasty as some other lamps.
Chit last night i just burned my hand on a 150 CMH after 6 hours operation with no air cooling i was picking up my plant to move around and bam i was touching bulb for 2 seconds owy left red mark but no pussing up (that means it didn't burn to deep in skin)
it was either bairly bump lamp but drop plant or keep burning hand to save plant.. i chose to save plant. and it was worth it..

to the leafy plants.. (outdoor plants are pretty leafy compared to HPS grows)
also go after a Sativa or Higher Sative % strain
the main reason everyone goes after Indicas is cause they are Generally short plants but with cmh you can go after a taller variety and get a shorter plant than you would under hps because the CMH Prevents/Stops Stretching..
I recommend mounting lamps at 3-4' (i do) and i get no stretch on plants off on the sides of the area..(shows even blues get to the base on the edges of the grow)

ya FB, that sucks bad.. Dont bump the lamps LOL..

Stink, ya said
"It does seem like a lot of people saying that CMH produces leafy bud (I have also heard people say CMH bud is less frosty), but I haven't seen any of the people claiming CMH produces leafy, non frosty bud actually post any pics showing leafy, non frosty bud.
The CMH buds you and smokesalot have posted are very frosty, and not particularly leafy.
Thanks for the responses guys. "

ya thats exactly it.. some plants do leaf up a bit but its ok and others have said its so bad but no one has seen proof of any negitive coments vs the good coments.
if cmh sucked or didnt perform as good as its being touted this thread and many others would have died off long time ago or had 100's of users coming back saying they dont grow dirt..

i will try to get UV data outa them for the CDM250 & CDM400 Series..

 

[Wacky Tobacky]

Hair? I remember that word. What does it mean?

Seriously though, I have no hair in that area. That's why I was so surprised to see the hole. You'd think I'd fell something.

lol well better your hat then your head.


Simba - Thanks for the info. i notice that people that are neg towards the CMH for flower dont have much evidence to back it up. i have seen some nice grows with the CMH in flower so im convinced.

 

[OsWiZzLe]

supers all,

as far as the UVB output from CMH all CMH put out UVA, UVB, UVC,
How much at each range is not Public released by philips or any other Direct MFR..
Not because its bad or super high.

and some cmh have UV Coatings to stop the UV from coming threw or at least minimizing at distance (like 8+feet)..
Adv Tech Has the UV outputs for all lamps but wont give them out..yet...not because they are bad rather they are waiting till they have 3rd party confirmation of there results.

I am under 20-4,000 Watts of CMH every day under many different model cmh lamps.
in my shed i have 800 watts CMH as work lights and i am out there allot with no Ill affects from CMH full SPD or UV rays..
I will say if u dont go out allot ya u might get a reaction.. (dont get allot of real sun)

i will say without the bulb getting air cooling By either a fan just blowing across it or air cooled hood they do get toasty but not as toasty as some other lamps.
Chit last night i just burned my hand on a 150 CMH after 6 hours operation with no air cooling i was picking up my plant to move around and bam i was touching bulb for 2 seconds owy left red mark but no pussing up (that means it didn't burn to deep in skin)
it was either bairly bump lamp but drop plant or keep burning hand to save plant.. i chose to save plant. and it was worth it..

to the leafy plants.. (outdoor plants are pretty leafy compared to HPS grows)
also go after a Sativa or Higher Sative % strain
the main reason everyone goes after Indicas is cause they are Generally short plants but with cmh you can go after a taller variety and get a shorter plant than you would under hps because the CMH Prevents/Stops Stretching..
I recommend mounting lamps at 3-4' (i do) and i get no stretch on plants off on the sides of the area..(shows even blues get to the base on the edges of the grow)

ya FB, that sucks bad.. Dont bump the lamps LOL..

Stink, ya said
"It does seem like a lot of people saying that CMH produces leafy bud (I have also heard people say CMH bud is less frosty), but I haven't seen any of the people claiming CMH produces leafy, non frosty bud actually post any pics showing leafy, non frosty bud.
The CMH buds you and smokesalot have posted are very frosty, and not particularly leafy.
Thanks for the responses guys. "

ya thats exactly it.. some plants do leaf up a bit but its ok and others have said its so bad but no one has seen proof of any negitive coments vs the good coments.
if cmh sucked or didnt perform as good as its being touted this thread and many others would have died off long time ago or had 100's of users coming back saying they dont grow dirt..

i will try to get UV data outa them for the CDM250 & CDM400 Series..

I guess shorter flowering time....better yields....and usually more potent herb have nothing to do with it ....So now your saying dont grow Indicas with CMH? Maybe those giant fat leaves block the weak ass penetration of those lights and since sativas are so lanky your CMH might be more effective..intresting...400 watt CMH 4 feet from your plants...hhhhmmm whats the light meter gonna read on that? its gonna be some str8 CFL shit ....Simba why dont u release the data on the UV bro....u are Adv Tech...i'm sure u can convince yourself to hook the public up.....

 

[simba]

OS,
the reason i say go after some sativia dominate is cause most go after the Indica only cause of height constraints (many many posts whats the shortest Plant i dont have much room to work with and under HPS sativas STREATCH)

and as we all know indicas have a Huge couch lock effect and most would rather have the Brain stimulating Uppity effect.(there is some who want more indica dominate but thats medical and cmh is great for that to but for the general pop go after some sativias and not have to worry about stretch.)

what on the edges cfl kinda shit.. Uh same effect with HPS Inverse Sq Law of light but since CMH starts with more energy in each range Especially Blue and Red there is more of it at the edges vs HPS (u walked into that one)
If u start with very minor spikes in True Blue and Red by inv sq law of light at the end of 4 feet direct theres not much there compared to cmh that puts out Allot more in each range thus providing more energy delivered to plant at More distance..

there are many places in the world its legal to grow..just about any thing.(including the medical states here in the USA)
i cant deny there those who grow illegally, i haven't heard about many busts so i can only assume most growers are in legit places..

and many legit peeps here in the states come to this forum for the great info the underground has to offer (everyone here has info before anyone else has it)
allot of the General gardeners show up here reading up..

no one professionally condones growing any thing even tomatoes its kinda funny even legit plants grown indoors are frowned upon depending who u talk to.
im sure 97+% of Adv Techs Customers are 100% Legit commercial. and the 3% aint saying what they doing.or are in there legal rights do do whatever. thats any business look at a hydro store

99% the reason i have adv tech link in my sig is because there is allot of info on there site. i always say buy locally if you can or buy from whoever just don't over or under pay..

 

[OsWiZzLe]

Simba....come on man....so in your theory....a 1000 watt Hortilux Blue should shit on a 1000 watt HPS from say 4 feet above the plants...due to its wide range of energy its putting off in the par spectrum.....i dunno if u should be pulling out the inverse square law out....because your all about PAR...according to the inverse square law any 400 watt bulb (HPS or MH) should be better then the 400 watt CMH..since at 4 feet from the tops of ur plant..ur lookin at 13,000 lumens vs like 7,000 from the CMH

 

[simba]

first off i dont tout Par or lumen ratings
i have said this before and i say it again
i don't like them but i think they where the best we had to cover hps and mh alone but now we need something more accurate for full spd that actully matches the eye and plant response in each nm range..

thats what we been saying over and over lumen doesn't count
(u cant go and 180 my words on this one)

Example why lumen rating is overrated IMHO
a Philips CMH 150 watt
4K puts out 12,000 lumens
3K puts out 12,900 lumens

Yet when people see the 4k and 3k side by side they say the 4k Is brighter to them.... Why.. its simple there is more energy spraweld accoss the full
the 3k has bit of blue spike of green, nice spike of orange, and bit of true red range. the 4k has nice even spread of blue gren with green/yellow spike and nice orange/red spike with nice spread of True Red..

we can only see so much in x nm range so ya the 3k may have more Rated Lumen s but the Lumen eye cant see them all..
just like plants more total energy doesn't mean any thing when you cant see or utilize it..

lumen is predominantly rated of 400-500
also some lamps have higher lumen output but have lower par than others at lower lumen but higher par..

for lumen response to light we see blues better at night and Reds better at day.. Within that during the day we see blues well.(scotopic and photopic)

Plant chlorophyll absorbs light at wavelengths of 400 to 700 nm. This is termed Photosynthetically Active Radiation (PAR)
unfortuntly it rates 500-600 just as good as it rates 400-500 & 600-700 WTF 500-600 is not as effeciantly used by plants as 400-500 & 600-700

now to the eye horti blue 1k vs 1kw hps..
i dont like that bulb first off its spd blows for growing another problem it drops it output fast like 65% lumen maint vs an hps at what 95% lumen maint. so within the first 500 hours the eye blue is not puting out nearly as it was day one where as the hps still is pouring it out..
with that said i would say most plants would be happier under the 1kw eye blue vs hps.. as the heat is not as bad and other variables.. (some can do better with the hps than the blue others blue over hps)but eye blue is not good comparison any way u look at it its nothing like CMH totally opisate and cmh has high lumen maint vs eye blue..

that's what we keep saying you can get away with 400w cmhs vs 600 HPS lamps and get good results. Just dont grow bushs.. (it can so be done and not skimp on overall resluts

and why i dont like kelvin i have seen many lamps with same kelvin but the spd is not even close.. kelvin is an overall color appearance..
so lumen, kelvin, par, etc. hogwash but best we had..

you wait soon enough there will be a new standard of lumen, par, etc..
an accurate one.. one based of energy at specific nm ranges outputted vs utilized and at what %...
chit if we all got together and came up with a good scale im sure it would be accepted pretty quickly.
chit really lumens are iffy to everyone any way you do it as each person sees light differently and so some who cant see x range will not think one is as bright as another.. (light energy is so simple its so complex or is it vice versa.. either way.. its deep LOL)

back to lumens..
why is it everyone who has seen cmh vs hps says cmh is brighter to them yet the hps puts out more "Lumens"..
even with MH.. and its spike blues.. it has higher lumen but appears dimmer vs 4k cmh at same wattage.

 

[Solar Puffer]

Greetings! Great thread- I switched to the CMH, they are as Kick-ass as people said they were. I am seeing adds now for a Phillips 1000w ceramalux bulb, is this for real? How about the GE PSL (photosynthesis light)? thanks!