400w MH fixture help

S

strobericaf

New Member
Hello guys, i want to ask you a question about this matter.
I found in my garrage a MH lamp.
Its a 400w MH lamp fixture with a Sylvania 400w bulb
Today i want to test it to see if it still works.
My big question is - can i use a 250w HPS bulb with this fixture ? I saw that has an ingnitor but im not sure if the HPS bulb work with this MH ballast.
I attached some photos with all the pieces in the lamp, hope someone good at this help me out here :)

Any help would be kindly apreciated.

IMAG0091.jpg IMAG0092.jpg IMAG0093.jpg IMAG0094.jpg
 
You can use a bulb with a higher wattage in a lower wattage ballast. If you try to use a 250W bulb in a 400W ballast it will not work.
 
I
HydroRed said:
You can use a bulb with a higher wattage in a lower wattage ballast. If you try to use a 250W bulb in a 400W ballast it will not work.
Click to expand...
No, i made a mistake in the first post.
It is 400w ballast with 400w MH bulb.
The question is can i use a HPS bulb with that fixture? Would that ignitor in the pics work ? I dont want to mess up something.
 
If it has an ignitor than it is for an HPS. A MH bulb will work on a HPS ballast, but an HPS bulb wont work on a MH ballast since the HPS needs an ignitor to fire and the MH doesnt. Digital ballasts usually run both and switches internally. Some magnetic ballasts have a switch to run either one.
 
HydroRed said:
So a pulse start MH will still fire on a HPS ballast then right? Or are the ignitors different from HPS to pulse start MH?
Click to expand...
I'm unsure that's something to look into.. but I wouldn't risk it a good switchable ballast cost less than a zip nowadays. Shit you can get a cheap setup on amazon for like $180 that includes hood ballast bulbs yoyos and a timer. So I wouldn't even bother trying to fire a hps on a mh ballast
 
Ok guys, this is the lamp that im talking about- the 400w MH
So you say that i cannot trplace the MH bulb with an HPS ? Im a little short in money and i eas thinking to veg with this 400w MH and for flowering to change to HPS
 

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strobericaf said:
Ok guys, this is the lamp that im talking about- the 400w MH
So you say that i cannot trplace the MH bulb with an HPS ? Im a little short in money and i eas thinking to veg with this 400w MH and for flowering to change to HPS
Click to expand...
If its a matter of being short on cash, just grow under the bulb you have from start to finish, even if it is under a MH. 4000K isnt a bad spectrum to veg and flower under.
 
What size room will you be using it in? I think that light will do well in a 3'x3' if not too overcrowded.
 
6 *small* plants. You should anticipate them getting about 3x their size in the first 2-3 wks of transition from veg to flower. You also want to give em a little "shoulder room" as well so you can get some light penetration to the lower canopy and not be so inclined to overcrowd and get powdery mildew etc.
Post back in here so we can see what you end up doing. :joint:
 
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