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You can definitely tell that the CMH emits more UV just by putting any part of your skin near the lamp. I'm fairly dark-skinned and can still tell. If you're really pale I'd suggest using caution around the lamp.
All that said, the plants love it, and that's ultimately what we're using the light for. Just use common sense with the lamp and all should be well.
Good work.....nice grow.
This is a CMH for you digital and electronic ballasts users.......
Life Light Tech Sun Pulse 400W Pulse Start Metal Halide 4K These lamps have also been designed to work with electronic and digital ballasts. They won't destroy electronic ballast or be destroyed themselves. These pulse start lamps were created to withstand the 4khz pulse that electronic ballasts use to ignite lamps,(this is what destroys standard MH lamps) only HPS grow lamps can handle this type of ignition process. Because our new Sun Pulse lamps are designed to withstand 4-6 kHz pulses, you will experience long and even lamp life approx (20,000 hrs) with little color shift or loss of FT-CD output. Special Features: Won't Damage Electronic or Digital Ballast Elliptical shaped arc tube for better distribution of light Long Lamp life Low color shift .
Google.... Life Light Tech Sun Pulse 400W Pulse Start Metal Halide 4K
Hey Dutch,
Love the Widow Grow....nice work..thanks for all the info as well..
Peace,
Treetops :thumbsup:
does any1 know how much uv-b this thing (cmh bulb) throws off?...from what i understand to much uv-b is bad...
Quote:
Originally Posted by dextr0
it throws off enough to burn my knuckles, when rotating the plants, once a day
...(which takes about 45 seconds)(most MH bulbs will throw off UV rays)
...[N: damn, I got a sunburn from these lamps! Exposition was around 7-10 minutes and I get the back of my neck and right hand hot!...G: n terms of the Aquamedic, how close were you to the lamp when you were burned? I assume worse would happen if you placed your hand in front of a zoo UV-b lamp at the same distance. If you looked at a zoo lamp (within a certain distance) I bet you would go blind. At 20" the Osram emits more UV-b than would ever reach the face of the Earth. You would only find that irradiance (photons hitting a target, ie. you) if you were about 9k-10k feet (more than 3k meters) up a mountain in mid summer at noon near the equator. Repite.com (MegaRay) will not sell the zoo lamp unless one owns a UV-b meter, works at a zoo, or is trained in the lamps use.It seems like the Aquamedic lamp is more broad spectrum into UV-a and PAR, yes? That would be good to add to a grow, but I doubt it offers enough UV-b. Well, let me rephrase that. I doubt it will emit the 'ideal' level of UV-b: 375 uW/cm^2. But, the Aquamedic may emit over 140 uW/cm^2 which is what I consider to be the lowest level of UV-b irradiance one would want to use to supplement their garden. I would have to look at the lamp, but I doubt there are UV-b readings available. Do you know of any such readings?...N: About half a foot]....i have been doing lots of "research" on bulbs lately. i am really intrested in cmh's and believe they are very prommissing but, if we are going to b growing with something its our responsability to look into certain things and make sure we dont harm ourselves or others (power of suggestion)...if the ub-b levels on the aquamedic lights are so high and it took 7 to 10 min...well how much uv-b are these new cmh bulbs emitting?? something to look into....imho
and as for your plants....[...G: Interestingly, research has shown that cannabinoid precursor (I forget which it is CB?) conversion into THC most likely happens with most efficiency, and hence, highest conversion into THC, between 280-290nm.[1] Even zoo lamp UV-b bulbs do not emit much irradiance in that short of a wavelength (aka nano-meter; which is the "length" of one "wave")...The trick to supplementing UV-b is short increments. In Nature the highest irradiance of UV-b is from about 11am to 3pm, four hours. We should try to emulate that time frame indoors. In all the studies I have read the researchers never used more than four hours per day-length of photoperiod. And most supplied UV-b post-solar noon. I am adding UV-b for two hours starting one hour after solar-noon (after 'midday' of day-length). Supplying more UV-b than four hours can injure plants, less is more in my opinion (to an extent).]...so like i said something to look into...sorry 4 double posting...
I think you are right...too long OR too close...can cause light bleaching...:(Quote:
Supplying more UV-b than four hours can injure plants, less is more in my opinion (to an extent).]...so like i said something to look into
...of information!
My :twocents:x3:
I have a Sunm4st3r Super MH Cool Deluxe 600w that suffered premature failure on my Lum4t3k 600w digital ballast (and was replaced by my fave d00ds @ Grown Hydro , love 'em!)... just wondering if it might have been due to the spike thingy that someone mentioned earlier, or if I just got a lemon bulb @first? I have heard that L. makes an adapter thingy that might help ameliorate this effect, but not heard much commentry.
This particular bulb/ballast combo is recommended by the distributor in my area, but they might not be aware of the problem. The bulb itself has a great spectrum, and was insanely good for veg (as well as tanning!). Am thinking of trying the bulbs that L-tek puts out next time I buy one, but the Life Light Tech bulb sounds kuul... can't seem to find the Lmtk ones in 600w :wtf:
The Uv-B thing, as well as the max exposure thing are great! This confirms something I've suspected for a bit, that the plant likes (and NEEDS!) a bit o' noonday sun, but doesn't wanna overdo it :D I'm just using killa fans rather than a cooltube @the mo, and the plants seem happier now that the bulb itself is an average 14" from 'em.
OMG, just noticed the time--have to go home and prep some water for the goils tonight!
Kudos to all wonderful informative posters here!