Both MH and HPS for flowering?

Discussion in 'Indoor Growing' started by [email protected], Mar 19, 2017.


    [email protected] Well-Known Member

    I have always used Hps for flowering but in my he setup I'm thinking of going with both HP's and mh mainly because I have them. In anyones experience are there any advantages of using both?
    fandango likes this.

    MichiganMedGrower Well-Known Member

    Yes fuller spectrum equals higher quality and a more positive finish for the flowers from my research and now my experience.

    Of course the grow itself and the environment and nutrients must be in balance to gain the benefits of the light spectrum.

    [email protected] Well-Known Member

    Thanks man. Really I'm just trying to get the most I can in the flowering room. I didn't want to buy another HP's if I didn't have to. Guess I'll give it a go and see how it turns out. I have a 5x5 flower room and the plan is to use two 400s one being the HPS and the other the MH.

    Evil-Mobo Well-Known Member

    Get the hortilux blue MH bulb for your MH setup. It gives fantastic results in veg and flower.

    MichiganMedGrower Well-Known Member

    I should have added I use Hortilux 600w Blue MH, Hortilux 600w Super HPS and a Phillips 315 LEC 3100k bulbs in flower.

    Pic from tonight

    So far (only Super hps until 4 months ago) yield has been equal but lowers have suffered in my system. Less density and more larf. I really had none previously. More overgrowth if I don't watch the nitrogen late in flower.

    Quality however is up. More flavorful. More potent and complex highs.

    I am still getting used to the new lights so there's that. And I am going to take 1 plant out of my room for better airflow and light penetration and see if that fixes the problem.

    ttystikk Well-Known Member

    That won't be sufficient light for that space.

    Honestly, you're chasing your tail here; MH is simply obsolete and while it will give good results once or twice, it will quickly dim and fail to give good results over time. Worse, it's very inefficient and will emit more heat than light into the space, requiring you to spend additional resources for cooling.

    The same can be said for HPS lamps. They're both late for their date with history's scrap heap.

    Frankly, there are better LED choices now on the market that will produce far superior results; both initially and years down the line. Costs have declined, as well.

    Investigate the LED threads here, with special attention to quantum board lights.

    You AND your plants will thank me.

    [email protected] Well-Known Member

    800watts isn't enough for a 5x5 area?? I have grow n with 600w in the same area and never had any problems. As far as LEDs go I'm not in the market for new lights just trying to use what I have.
    Last edited: Mar 20, 2017
    Chunky Stool likes this.
    lio lacidem

    lio lacidem Well-Known Member

    You are always on here pushing leds. You do realize there are quite a few people here who have switched to led and after 1-2 runs returned to hps for flowering. I did keep led In the veg room but will be changing that soon aswell.

    MichiganMedGrower Well-Known Member

    The topic of the thread is metal halide and HPS. Can't you read? Why can't you answer on topic?
    lio lacidem likes this.

    MichiganMedGrower Well-Known Member

    Also the LED salesman is not wrong about the wattage of the lights. 800 watts of HID is perfect for a 4x4 space at 50w per square foot.

    But if you just keep the plants off the edge of the space I think because it's 2 overlapping lamps it will work fine.

    Or ideally 1000w in the 5x5 is normally suggested.

    [email protected] Well-Known Member

    Thanks. 800w is what I got so I guess I'll run it and hope for the best.
    Dr.Nick Riviera

    Dr.Nick Riviera Well-Known Member

    MichiganMedGrower likes this.

    MichiganMedGrower Well-Known Member

    That's fantastic for you!

    Of course the OP just said he already has 800 watts of single ended hid and wants to know about combining mh and hps.

    But I do agree the single ended metal halide will help keep plants more compact and add more resin. They do in my room.
    Dr.Nick Riviera

    Dr.Nick Riviera Well-Known Member

    What's the point of LED at this point? It doesn't run cooler, it doesn't cost less in electricity, it isn't cheap to buy. I mean, didn't they just bust you on your electric bill? shouldn't running LED make your bill go down?
    growingforfun likes this.
    Dr.Nick Riviera

    Dr.Nick Riviera Well-Known Member

    I was letting OP know that there is another way to use MH, but of coarse you know it all, so, go ahead and have your meltdown now, I'll just sit here and LOL, Again
    MichiganMedGrower likes this.

    MichiganMedGrower Well-Known Member

    Yet you tell off another poster for being off topic right before defending you doing it yourself.

    And I admit I LOL'd at the led power bill comment.
    Dr.Nick Riviera

    Dr.Nick Riviera Well-Known Member

    did your mommy not hold you enough? Does your girl not know how to give a good BJ? You need some serious attention. Good luck kid.:dunce::dunce:
    MichiganMedGrower likes this.

    MichiganMedGrower Well-Known Member

    Lame response even for you. ;-)
    Chunky Stool and growingforfun like this.

    chemphlegm Well-Known Member

    as my perpetual room is rotated all plants finish under my 1k MH for about two weeks after their HPS experience

    visajoe1 Well-Known Member

    I dont know where you havent read, but LED's do run significantly cooler and can be 50% more efficient with electrical usage at the same PPF HID's put out. I only run a small tent, 2.5' X 2.5' and replaced the 250w hps in there previously with 2 cobs running 180w. Tent temps dont increase more than 1 degree above room temp, wattage is down about 25%, PPFD is 850 at canopy, and spectrum i chose is better for flower (3000k vs 2000k hps). total light cost was about $160

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