whietiger88101
New Member
i personnaly grow from birth seeds to one month old only under MH 400watt then at the one month i switch over too the HPS .
...youre complicating things.I guess if no one has ever done this experiment (growing with HPS, then MH, then one for veg and another for flower, and then a mix), I will end up having to do it myself. I am fairly sure someone, somewhere has done this type of experiment. I'm fairly positive as large as this site is, someone on it has already done the experiment, or at least a majority of it. So, I'll keep bumping this up in the hopes they see it and answer my question.
Appreciate the input, but are you saying you "believe" that both are needed during flowering, or have you grown with different lights and have determined that both are needed through your own experimentation.woodsmaneh! is giving you good info!
Though I respect ed, I don't really agree with his conclusion on this one. Photosynthesis peaks at several wavelengths, and though you want to cater to chlorophyll A more, it still peaks at similar ends of the spectrum, and I am a believer in giving a wider spectrum opposed to a more narrow targeted spectrum (though I do believe in going for peaks around where chlorophyll peaks). The red spectrum has been shown to be slightly more efficient at producing sugars, but it's actually a minor difference in everything I have read. I still think variety is the spice of life![]()
You are just going to get a bunch of different opinions.Try it for yourself and you will know what you want.I guess if no one has ever done this experiment (growing with HPS, then MH, then one for veg and another for flower, and then a mix), I will end up having to do it myself. I am fairly sure someone, somewhere has done this type of experiment. I'm fairly positive as large as this site is, someone on it has already done the experiment, or at least a majority of it. So, I'll keep bumping this up in the hopes they see it and answer my question.
Out of interest why are you downgrading your wattage during veg? you are only decreasing your yield, why not 400 hps whole cycle? I can understand maybe 150 hps for the first week or so but not the whole veg cycle.You are just going to get a bunch of different opinions.Try it for yourself and you will know what you want.
Me personally i veg with a 150 hps and flower with a 400 hps.So yeah i use hps all thru.Ive used mh and hps and i really dont see much differnce in yeild if any difference.Just plants grown under hps will be alot taller,node spaced out more than if you would veg with a mh.
Never used mh and hps during flowering at the same time but if i want blue light in there i would just add cfls.I do feel like mh is a waste of electricity.I rather use t5s or my hps.
Thanks. This is the kind of information I have been looking for, someone who has used HPS only as well as MH and HPS. Southern Homegrower, except for the stretching of the plants under HPS only, did you notice any difference in the quantity/quality of harvest compared to when you went MH for veg and the beginnings of flowering?I use mh and switch to hps 2 wks after i go 12/12. My plants stretched to much with just hps.
While I know the hybrid lights give the blue spectrum of the MH as well as the red of the HPS, I have yet to find anywhere where someone has done an experiment comparing results to HPS only and other combinations. I think the hybrids would do a better job of coverage than changing the ratios of lighting, simply because they are side by side and so you would get both bandwidths hitting the same area, but that is just my thought on the matter and I have nothing to back it up with.country farmer what is your opinion on the Hybrid lights? That has both in one...
I do not believe that both are needed, there are many many examples of people using all HPS, all MH, all CFL, all T5, all LED, etc, and getting great results (and examples of people using them and not having great results also). There are so many variables that without setting up a proper experiment with controls it's difficult to say one way or the other. Personally I have grown with MH, HPS, and T5's. I currently flower with a MH and HPS and I get better results than when I used the MH or HPS alone (keeping in mind it has been several years since I used an HPS alone), however it's twice as much light as when I had either alone, so really hard to tell that it was a difference made by spectrum (actually, impossible to say if the spectrum had anything to do with it). I tried to phrase my post as my opinion, and I actually think your whole question is more a matter of opinion and individual experience than a hard rule (based on the research I have done, which is conflicting).Appreciate the input, but are you saying you "believe" that both are needed during flowering, or have you grown with different lights and have determined that both are needed through your own experimentation.
There are a lot of things in this hobby that aren't black and white. There are so many variables. I get what you're saying, but I'm not really trying to endorse one method or another, more just give you an alternative viewpoint. I am not the expert source that Rosenthal is (not saying anything about my knowledge, but ed has written many books, coauthored one with my favorite grow author, as well as written for high times, no way I can match his resumeNot trying to be difficult here, but while I am relatively new to growing, and will be brand new to indoor growing as soon as I complete my room, I do know the nature of people. We tend to fall in love with a solution for various reasons and then stick with it. Most of us are creatures of habit.
The way I like to look at a lot of these questions is on how much benefit things might have. From my experience and looking at many other growers, it just doesn't seem like these spectral changes are making a dramatic difference (assuming they are providing one of the chlorophyll peaks with sufficient intensity). Not to say there isn't a difference, but for instance, the intensity of the light has always seemed to me a much much larger difference in the end product than which light I chose to use. The type of light (and therefore spectrum) have not seemed to make as dramatic of a difference to me (as long as you are covering a photosynthetic peak), in fact, oftentimes if I don't know which light is being used (say in pictures), I can't really tell what type of light was being used.What I am requesting here is if someone has already played around with their lighting, tried Ed's way, Jorge's way and the combination of both types of lighting throughout and determined in that manner what has been best for them. I know that I can get a crop using any of the above. Like I said, I know I could fill my room with enough incandescents if I wanted to and get a grow (although that would be really, really inefficient).
None taken at allSo, no disrespect to anyone who has their favorite method, but I really want to hear from someone who has tried growing with various combinations of HPS and MH and what they determined was best. I'll probably perform that same experimentation myself over at least three different grows, but I am just looking for some input from someone who already has done so.
Is that what your grow experience has shown you? Or is that just how you have always done it?mh then hpsits the best way to go
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Like someone here said there are a lot of differences from one grow room to another . One persons grow room may have low rh or high rh, temps may go up and down more drastic. My grow space is 7 ft tall and with my aero tubs and lights only left me about3 1/2 to 4 foot of plant height. So when used hps the hole way through plants got to tall and the light and heat from being so close to the plant hurt my yield . If you are thinking of using ceramic bulbs there is a person named riddleme that has great grows and he is an ace for answering ? He knows his shit. I have been hearing good things about ceramic bulbs from people who know what they are doing so i beleave what they say but i have not tried themThanks. This is the kind of information I have been looking for, someone who has used HPS only as well as MH and HPS. Southern Homegrower, except for the stretching of the plants under HPS only, did you notice any difference in the quantity/quality of harvest compared to when you went MH for veg and the beginnings of flowering?