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    600w dimmable ballast

    hi is anyone there able to answer this question please I'm am just wandering if you can dim a 600w bulb down to 250w on a dimmable ballast or if I have to buy a 250w or can I use the 600w bulb and dim that down to 250w?

    #2
    You can dim the 600w bulb if the ballast is dimmable.
    #TeamAutoMechanics

    Previous grow journals:
    Pure Power Plant and Blue Mystic + Freebies
    Girl Scout Cookies and Gorilla Glue (AutoMechanics Grow Thread)

    Grow Room Video: https://vimeo.com/218651917

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      #3
      Hey 23, yes you can dim a 600w bulb down to 50%,75% setting on a dimmable ballast. I hear it shortens the bulb life.
      Seems safer to use a 600w bulb on a 600w ballast dimming it then using a 250w, get high and accidentally turn up your ballast, don't know what kind of problems it can make and wouldn't want to find out with the cost of bulbs and ballast.
      hope this helps
      Current Grow:
      https://forum.growweedeasy.com/forum...ew-grower-here

      Past threads:
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        #4
        I'm no electrical engineer, but I'm not sure that dimming it will shorten its life. If anything I would think it would extend its life. You're only applying less power to it, which is why it's dimmer. Applying more power than it's rated for would almost certainly shorten its life.
        #TeamAutoMechanics

        Previous grow journals:
        Pure Power Plant and Blue Mystic + Freebies
        Girl Scout Cookies and Gorilla Glue (AutoMechanics Grow Thread)

        Grow Room Video: https://vimeo.com/218651917

        Comment


          #5
          With the ballasts I've had and have all dim able 600 watts I've not come across one that can b set to 250 watts 200,400,600 is all I've ever seen, my 2$

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            #6
            it can change the light spectrum put out by the bulb as they're designed to work optimally at their rated wattage
            Completed auto grows 3

            2x4 Gorilla tent
            600W HPS
            Coco
            GH Flora Series trio + Armor Si, CALiMAGic, RapidStart, Liquid KoolBloom, Floralicious Plus, FloraKleen, Diamond Nectar, FloraBlend, FloraNectar (Pineapple Rush version), Dry Koolbloom + Great White mycorrhizae & Terpinator

            Grows using this setup: 1
            Largest yield from this setup: 20oz / 567g

            Previous grows:
            http://forum.growweedeasy.com/forum/...row-first-grow
            http://forum.growweedeasy.com/forum/...world-of-seeds

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            • Potted
              Potted commented
              Editing a comment
              I would agree with u on that OZ

            #7
            I have a DM myself I run it on the lowest setting 400 watts I then use a 400Watt bulb

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              #8
              Hey Potted here's a 600w ballast with 600wboost, 600w, 400w and 250w setting. Not the one I have.

              i have 2 x 600w dimmables with 600+w boost , 600w and 400w settings only.

              Comment


                #9
                Something to consider when dimming the lights........

                NEMA recommends that high-pressure sodium lamps not be dimmed below 50% of rated lamp power. Dimming below the recommended minimum can significantly degrade lamp life—potentially voiding lamp warranties—while also affecting efficacy, color and lumen maintenance. For retrofit metal halide lamps designed to operate on high-pressure sodium ballasts, and specialty high-pressure sodium lamps (e.g., internal ignitor, etc.), consult the lamp manufacturer about whether dimming is allowed and resulting parameters and limitations.

                Besides dimming range, NEMA recommends that high-pressure sodium lamps be operated at full light output for at least 15 minutes before dimming. If a voltage interruption extinguishes the lamp, the timer should be reset only after the lamp has restarted. For more information, consult the Guidelines.

                Note that dimming some high-pressure sodium lamps and retrofit metal halide lamps can result in changes to color temperature, color rendering and efficacy. NEMA further points out that high-pressure sodium lamps are susceptible to “drop out”—sudden extinguishment—if rapidly dimmed after the lamp operates for about 15,000 hours. Users may confuse this with the lamp having failed; if the user allows the lamp to cool, the lamp will relight and operate at its rated wattage for its rated life in an undimmed mode. To reduce the potential for this, NEMA recommends slowing the dimming rate to about 1.5 minutes from full output to maximum dimmed condition (while maintaining sufficient voltage to sustain the arc).

                https://lightingcontrolsassociation....-lamp-dimming/

                Comment


                • Marley
                  Marley commented
                  Editing a comment
                  Interesting stuff. That's why I'm no electrical engineer!

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