Let's just talk about BULBS!
- Thread starter jonnynobody
- Start date
Cory and trevor
Well-Known Member
http://www.hydroponics.net/i/137525
this is the shit. my plants will jsut crawl out from under any other light to reach for the CMH across the room. it's crazy town. 400 watt HPS magnetic balast tho, don't forget that and 400 is as high as they go I am pretty sure.
this is the shit. my plants will jsut crawl out from under any other light to reach for the CMH across the room. it's crazy town. 400 watt HPS magnetic balast tho, don't forget that and 400 is as high as they go I am pretty sure.
Cory and trevor
Well-Known Member
eggad that's badass!
Kite High
Well-Known Member
friendlyperson92
Well-Known Member
the way i see. if it's not producing a special light (which it's not) buy cheap. the only difference is whether the bulb works or not. a more expensive bulb may have a longer life or special things like lower temp, more spectrum like you listed. but 6500k spectrum is the same no matter how you look at it or what name you put on it.
Kite High
Well-Known Member
6500K color temp can be achieved by a wide variety of nm wavelengths combinations or spectrums...some of which would provide very little of what the plants want
friendlyperson92
Well-Known Member
it was an example. 6500k is the spectrum... you obviously don't know what you're talking about lol. no offense.
actually. doing research. hold on that you're wrong comment.
actually. doing research. hold on that you're wrong comment.
kinddiesel
Well-Known Member
agro bulbs i have 3 1 k fast growth bright ! 6500 k stupid bright . and hps bulbs great looking plants used for 6 months still going strong running the 6500 24 hours a day, looks bright as can be, its recemended for a change every 6 months
Kite High
Well-Known Member
you are mistaken friend...6500k is the COLOR temperature on the Kelvin scale of the light which comes from the temperature a piece of carbon is heated to to obtain that color...spectrum are measured in wavelengths of light... nano meters or the distance between peaks in the wavelength of light emission...for instance blue light is around 450 nm and red light is around 650 nm...that is the spectrum...
friendlyperson92
Well-Known Member
like you said the 6500k is the color temperature. and we know that colors are seen because they are at different wave lengths. so a 6500k bulb has relatively the same wave length as any other because the color temperature is the same. so say for instance it's violet. and violet is 400 nm. all violet will be around 400nm. i was initially wrong with the 6500k is the spectrum comment, but my original comment is still valid. unless there is something im not seeing.
references VVVVVV
http://science-edu.larc.nasa.gov/EDDOCS/Wavelengths_for_Colors.html
http://intiridesigns.com/images/lightsourcesChart.jpg
references VVVVVV
http://science-edu.larc.nasa.gov/EDDOCS/Wavelengths_for_Colors.html
http://intiridesigns.com/images/lightsourcesChart.jpg
Cory and trevor
Well-Known Member
neat guys. plants like the bulbs better; thats the only fact I need and I got it. Found all the answers right in my grow room. continue pissing contest.
Rrog
Well-Known Member
I'm not a big believer in the value of blue during veg or flower, but clearly the red is handsome on the CMH.
So one of the links is to a CMH with more than 400 Watts? 830 watts, is that right?
Is the penetration an issue, relative to a 1000W HPS? It would seem the 1000w would have the advantage in canopy penetration.
So one of the links is to a CMH with more than 400 Watts? 830 watts, is that right?
Is the penetration an issue, relative to a 1000W HPS? It would seem the 1000w would have the advantage in canopy penetration.
Danksnaps420
Member
i use 2 sun blaze t5's for veg/cloning. and a 600w horti for flower for my small personal garden. my plants are happy 
Kite High
Well-Known Member
I do not suspect penetration would be an issue...sure its less lumens but that is because there is much less green and yellow in the spectrum and more blue and red...lumens focus on the light humans perveicve best...green and yellow opposite of what plannts use...but the energy factor is actually higher then the lumen rating indicates because of the spectrum...and I find blue light and uvb to be greatly beneficial....but NO cmh does NOT provide useful amounts of uvb...NO hid bulbs do other than a couple of mh available here:
http://www.reptileuv.com/megaray-metal-halide-uvb.php
Kite High
Well-Known Member
my point being the manufactures can obtain kelvin readings of the same measure using manipulation of the green and yellow (500-600nm) and achieve a higher or lower kelvin while not actually producing more blue wavelengths...so do you still think I know not what I speak?
friendlyperson92
Well-Known Member
ahh. so you're saying that the better brands use better tests on their bulbs and are likely more accurate. that makes more sense.
Rrog
Well-Known Member
Kite High, I use their lamps for UV-b. Those exact lamps. Have for years. I agree the others are for shit. And thanks for pointing out that the MH does not produce much UV-b. Seems clear looking at the spectral analysis, but people often bring that up.
Anyway I hear what you're saying about less lumens overall but more where it counts. Very interesting. When I was last reviewing lamps, CMH was just becoming a buzz and I thought I'd stick with HPS.
Thank you taking the time to post this great info and insights, Kite.
Anyway I hear what you're saying about less lumens overall but more where it counts. Very interesting. When I was last reviewing lamps, CMH was just becoming a buzz and I thought I'd stick with HPS.
Thank you taking the time to post this great info and insights, Kite.
stumpjumper
Well-Known Member
I've seen some pretty damnimpressive results from people flowering with MH... Side by side with MH and HPS and the MH blew the shit out of HPS... Theres a thread over at ICMag about it.
I didn't buy a CMH because 400w... but now with the new 830w I'm tempted, very much..
I didn't buy a CMH because 400w... but now with the new 830w I'm tempted, very much..
Rrog
Well-Known Member
Stump, check out post 55. I'm also interested in the 830. Or maybe the 400 has plenty of penetration
Another thing that's a little relevant is that the plant enters its flowering stage because of photoperiod. The "red sun in the late fall" isn't the primary factor.
I say this because you used to see people talking about this. Probably a long time ago.
So a lot of blue in flower couldn't hurt.
Another thing that's a little relevant is that the plant enters its flowering stage because of photoperiod. The "red sun in the late fall" isn't the primary factor.
I say this because you used to see people talking about this. Probably a long time ago.
So a lot of blue in flower couldn't hurt.