what spectrum MH lamp ?

what spectrum MH lamps must be used for vegging ?
there are too many MH lamps in market.
eg,sunmaster warm deluxe neutral=4000k,cool deluxe = 7200K
Sunmaster HPS MH Conversion = 6000K

i am confused.which one is true ?
In addition, can all 600w MH lamps be used with all 600w hps ballast ?
and can i use 600w MH lamp in 125mmX490mm cooltube ?
(MH lamps are bellier than HPS lamps )

thanks

I never fooled with MH and just used HPS though my entire grows with excellent results.

isnt there really any difference between MH and HPS during vegging ?i am confused :S

charlesweedmore said:

isnt there really any difference between MH and HPS during vegging ?i am confused :S

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Ideally you would want MH 6500k . Metal Halide is best used for Vegetative growth, as it keeps your plants Compact doesn't allow as much stretching.

Most would sugges tthis, and then when you switch into flowering, you should wait a week or two, and then swiitch over to your HPS 2700k .

But either way, both lights put out enough lumens to grow a plant from seed to harvest, just not to its best ability.

charlesweedmore said:

isnt there really any difference between MH and HPS during vegging ?i am confused :S

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There is a difference, MH is a little better for vegging. But here is the deal. I veg for about 4 weeks and flower for 8-9-10 weeks. The time is flower is at least 2x longer than veg and since HPS is better at flowering it makes sense to use HPS if you want only one light. My last grow with a 400W HPS was about 9 oz with 4 weeks of veg and 8 weeks of flower.

Basically, I don't think the added growth from using MH in veg is worth the hassle.

If you are set on using two lights I apologize and I hope a MH expert comes along.

EDIT: Here is a thread I found you might like: https://www.rollitup.org/general-marijuana-growing/9582-marijuana-light-spectrum.html

How many plants did you grow to get 9 oz,just wondering?

stoned1 said:

How many plants did you grow to get 9 oz,just wondering?

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3 - Nirvana's Bubblicious.

thanks mate,
dual spectrum hps may also help vegging

i will already use floros for first 15 days...and it is not reasonable to buy MH for the rest 15 days of vegging..i may buy in future..but not now..
thanks

charlesweedmore said:

what spectrum MH lamps must be used for vegging ?

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For the most part MH is MH when it comes to light spectrum. Like anything else there are higher quality and lower quality products to pick from but if it is a MH light the light spectrum will always be very close to the same of any other MH bulb.

there are too many MH lamps in market.
eg,sunmaster warm deluxe neutral=4000k,cool deluxe = 7200K
Sunmaster HPS MH Conversion = 6000K

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Other than the conversion bulb the rest are basically the same other than some variation in quality of materials and construction but not in light spectrum. For that fact the conversion bulb would still fit in that same group when it comes to light spectrum but I somewhat separated it because its design/construction/materials allow it to run off a HPS ballast and the others will not.

i am confused.which one is true ?

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There is no true or false. There is difference in quality and there is difference in versatility in the case of conversion MH bulbs.

In addition, can all 600w MH lamps be used with all 600w hps ballast ?

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As far as I know any conversion bulb of any wattage can be used with any HPS ballast made for that wattage.

and can i use 600w MH lamp in 125mmX490mm cooltube ?
(MH lamps are bellier than HPS lamps )

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That depends on the design/manufacturer. The last MH bulb I bought was much fatter than any HPS bulb I ever had. I cannot say for sure if all MH conversion bulbs will or will not fit in a Cool Tube but I am sure that you can find some that will.


Then you can also use a dual bulb that is both MH and HPS. It has both kinds of filaments, they call them "METAL/SODIUM" bulbs. In the case of a 600 watt "METAL/SODIUM" you would basically have 300 watts of each type of light spectrum. Of those I have read about they run off of a HPS ballast.

I cannot say I have an interest in them but some people may swear by them.

Ok I would so +rep Brick Top, but I already have. So, I expect everyone else to give him some +rep, he deserves it. You guys should see all his posts. There all filled w/ very useful facts.

I agree with just skipping halide and using the hps. Technically if you're in a hurry to get them big in veg then maybe a 6500k halide conversion bulb is worth it to you, especially if you will vegt a long time to grow trees. But many just start under flouro's or cfl's and then go straight to hps for most of the veg time. Halide grows leaf faster, you can see it sidexside but it's not double the growth or anything crazy like that. HPS is maybe 80% as good for veg in my book.

thank you my friends..

i did some searches on many forums and MH seems like waste of money..MH may be little better than HPS or floros when vegging..but there is not huge difference.
SINCE,i will use floros for for first 15 days of vegging ..i think MH lamp is not needed for the rest 15 days of vegging stage.. (i vegg for 1 month )

i prefer dual spectrum HPS lamps ..


i have a grow tent and i will put 58 watt T8(or T12) floro tubes on every 4 corners ..

t5's or better yet t5ho's
The others don't have the power needed. They'll just add heat but no real useable light.

there is no power difference between T5 , T8 or T12. almost all floros would give same lumens @ same watt.
T5 lamps is thinner than T8 and t12.
thats all.

charlesweedmore said:

there is no power difference between T5 , T8 or T12. almost all floros would give same lumens @ same watt.
T5 lamps is thinner than T8 and t12.
thats all.

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The thinner lamps allow more light to be reflected to the plants by design and are slightly more efficient. t5's would give a little more lumens with less heat at the same watts.
t8's are the best bet though on a budget for sure, if you can't find cheap t5's.

But, I wouldn't add any flouro's myself. If I wanted more light I'd get a bigger HID in a cooltube because then the heat in the space is so much easier to manage and you'd get more lumens that way.

If I wanted more light I'd get a bigger HID in a cooltube because then the heat in the space is so much easier to manage and you'd get more lumens that way.

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sure,HIDs are the best..
but i have a cooltube and there is hps in cooltube..i dont want to remove ventilation tubes from cooltube whenever i want to use MH instead of HPS..
that is why i will use HPS dual spectrum for the rest 15 days of vegging..
besides,i put floros on every corners..