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Thread: Running dual spectrum lights MH/HPS for flowering

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    Running dual spectrum lights MH/HPS for flowering

    Anyone ever done dual spectrum lighting for flowering before? I've done a few grows with just HPS for flowering, but some stuff I've read says the blue light from MH bulbs will be helpful even in flowering.

    So this time around, my 8X8 grow room has (left to right) a 1000 watt HPS, a 400 MH, and a 400 HPS. I put the MH in the middle so its blue light can get to all the plants at least somewhat.

    Has anyone ever done this, and did you notice any different results compared to just using HPS alone for flowering?

    So far my plants seem to be doing very well. Lights-on room temps are around 90 after the first few hours and stay there the rest of the 12 hour lights-on period, and temps fall into the upper 60s at night during lights-off time.

    This is a Fox Farms soil grow, FF nutes + open sesame, molasses, clearex, liquid bat guano, and a little bit of magi-cal, no CO2.

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    Re: Running dual spectrum lights MH/HPS for flowering.

    Bump i would like to see some response to this question aswell.

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    420 Member Thew1sest's Avatar
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    Re: Running dual spectrum lights MH/HPS for flowering.

    This is just my opinion i've gathered from posts on this and similar websites, but I see that the grows with the larger and higher quality grows have a light spectrum of 2:1 during flowering. I'm not saying strictly HPS won't grow high quality high yield results but that the 2:1 ratio typically ends in a larger yield on average. Yes the 2:1 from HPS and MH together should be great for the plant as long as the temperatures are taken care of. I think the plant would like the difference in spectrums too because it does use both spectrums for most of its life cycle just smaller %s during different phases of its growth ( ie: veg and flower) So I say go for it! Your plant will tell you if theyre not liking/ enjoying the light. But this is just my opinion if that matters haha Happy growing!!!


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    Re: Running dual spectrum lights MH/HPS for flowering.

    Thew1sest
    in your honest opinion. With 2x 600 watt hps/mh combo bulb( been thinnking about a Philips 600 Watt HPS SonT Agro Lamp or Digilux Metal Halide and High Pressure Sodium bulb) with some adding lighting from fluorescent's i was think some where in the area of an extra 3 x 96watt or 8100 lumen per bulb in a 400 - 450 nano meter color spectrum. could effectively cover a 5'x5' area. which should give 2x600(88500 lumens) hps 3x96(8100 lumens) watts power compact , 59 - 60 watts per sq ft. and 7400 lumens per sq ft.
    Randy not trying to high jack your thread

    BT
    Last edited by BayouTooloulo; 12-14-2010 at 09:56 PM. Reason: typo

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    420 Member WillyBudz's Avatar
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    Re: Running dual spectrum lights MH/HPS for flowering.

    I used to use a 1000w HPS only, I decided to try out a 400w MH / 600w HPS combo. I am pleased with the results, I can place the two lights much closer to the plants and have a little more flexibility if I need to move them.

    If I could afford it I would prolly go 600w MH and 600w HPS.... gonna have to wait a while tho.


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    Re: Running dual spectrum lights MH/HPS for flowering.

    Running a MH and HPS seems to make sense. My opinion is it wouldn't hurt.

    But.... What about running a dual arc bulb from one ballast? These bulbs are basically both a MH and HPS in one bulb. They're pretty expensive but if using both HPS and MH really is better during flowering then I would buy these bulbs.

    I think this would also be better than running two separate ballasts with different bulbs. A single bulb would more effectively blend the spectrum's then 2 light sources.

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    Re: Running dual spectrum lights MH/HPS for flowering.

    If anybody has any further info. on this topic or can direct me to another thread that does I am definately interested! Thanks a lot.

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    Cannabis Connoisseur - Nug of the Month Winner - November 2012 Be Irie's Avatar
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    Re: Running dual spectrum lights MH/HPS for flowering.

    Quote Originally Posted by M00gle View Post
    But.... What about running a dual arc bulb from one ballast? These bulbs are basically both a MH and HPS in one bulb. They're pretty expensive but if using both HPS and MH really is better during flowering then I would buy these bulbs.
    They get really hot inside the hoods, and I have heard they burn out bulbs much faster...

    I run 2000 watts of HPS and 1000 watts of MH in the flower room. I run about 25% of the flower room with MH.. I will be dropping a third spectrum (CMH vert) in there soon, heck, may even add a LED to cover about everything... I will always have an MH involved in the flower room..

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    Re: Running dual spectrum lights MH/HPS for flowering.

    The dual bulbs run very hot. I don't like them much. I've never had one blow out, though...

    Growzo

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    420 Member burrr's Avatar
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    Re: Running dual spectrum lights MH/HPS for flowering.

    rumor has it that the UV light released by MH helps to increase thc levels during the last weeks of flower. I switch from hps to mh for the end of the flower cycle.
    It has other benifits too, Buds are more colorful to look at and take pics of. Plus, makes it easier to see any mold that might be trying to grow.

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    420 Member ganjasism's Avatar
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    Re: Running dual spectrum lights MH/HPS for flowering.

    Quote Originally Posted by Be IRIE View Post
    They get really hot inside the hoods, and I have heard they burn out bulbs much faster...

    I run 2000 watts of HPS and 1000 watts of MH in the flower room. I run about 25% of the flower room with MH.. I will be dropping a third spectrum (CMH vert) in there soon, heck, may even add a LED to cover about everything... I will always have an MH involved in the flower room..
    I was thinking of doing something simlar. What's the size of yur room? If you don't mind me askin'. THX.

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    Re: Running dual spectrum lights MH/HPS for flowering

    I switched to dual arcs for my last grow. The yield was significantly smaller. Can't say for sure how much smaller, as I had two plants that were a strain I haven't grown before. However the potency and flavor of my afghan kush(a strain I have been growing for a year from clones) was significantly improved.
    Additionally, the plants seem to stretch less under the dual arcs.
    If I were growing commercially, I would stick with HPS (the yield loss was significant), but since I'm only growing for my personal use, 5 plants in a 4X8 sun hut under 2 1000 watt dual arcs still has me making a lot of hash and butter in order to stay under possession limits.
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    Cannabis Connoisseur - Nug of the Month Winner - November 2012 Be Irie's Avatar
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    Re: Running dual spectrum lights MH/HPS for flowering

    The room is now sized down from 13'x5' to a 8' x 5' for now and I am running 2000 watts, 1600 HPS and 400 vertical CMH.. I pulled the 1000 MH and put it into a 4x4 tent, since i am not using the other 5' of the flower room. The vertical 400 has made quite the impact in the garden, the lower parts of some of the plants look like the top cola, and some of the bigger plants are reaching over trying to get into the CMH foot print... I have always liked to mix the spectrum's like that and as soon as my buddy is done with borrowing my other 400 that will be CMH'd and dropped vertically on the other side... I pretty much am going to let the CMH's take the place of the MH in the flower room...

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    Re: Running dual spectrum lights MH/HPS for flowering

    Quote Originally Posted by Be IRIE View Post
    The room is now sized down from 13'x5' to a 8' x 5' for now and I am running 2000 watts, 1600 HPS and 400 vertical CMH.. I pulled the 1000 MH and put it into a 4x4 tent, since i am not using the other 5' of the flower room. The vertical 400 has made quite the impact in the garden, the lower parts of some of the plants look like the top cola, and some of the bigger plants are reaching over trying to get into the CMH foot print... I have always liked to mix the spectrum's like that and as soon as my buddy is done with borrowing my other 400 that will be CMH'd and dropped vertically on the other side... I pretty much am going to let the CMH's take the place of the MH in the flower room...
    That sounds nice. I'd like to do something like that in the near future

    It's kinda like the suns rays in the morning and evening are less direct and are more subtle as compared to the noonday sun. So I honestly believe a mix of color spectrum is optimal.

    I've also been wondering about the HPS coming on first for 4 hours(morning), then the MH for 4 hours (noonday), then the HPS for the remaining 4 hours(sunset)??? Any thoughts? Or having them both on all the time better?

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    Member & Nug of the Month July 2012 Member of the Month June 2014 Icemud's Avatar
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    Re: Running dual spectrum lights MH/HPS for flowering

    I am new to growing but really looked a ton into lighting before buying my set up and decided to go 400w MH and 600W HPS. I also read a lot of information and what you guys posted above I came to the same conclusion. Seemed that many facts lead to using MH during flowering with HPS increased yield slightly but quality of smoke was much better, so thats what I went with. I really want the best tasting nug I can produce so wanted to do it as correct as possible my first round, so that I had a good bar to use for future grows.. Check out my pics on my grow journal. It seemed having the lights set in a very wide triangle gave the best overall tent lighting and helped reach the lower branches better. ( I also have them air cooled so heat in the tent is really not an issue, (see pics on journal) You can track the grow and comment if you would like. I am still in veg and should be switching to flower within the next 2 weeks. Lemme know what you think...

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