HPS question

Discussion in 'Growing Marijuana Indoors' started by thepreciouslamb, Aug 11, 2011.

  1. #1 thepreciouslamb, Aug 11, 2011
    Not sure if this is in the right forum, but I have a few questions about my 400w hps setup: I have a 400w hps w/ that cool tube (glass cylinder around the bulb, w/ a reflector inside the top of it). Does glass filter out UV rays or other absorb any light? Also, Should I use a standard 400w hps bulb, or use ones that are labeled "full spectrum, or "plant growing light"? I use the hps to flower, not to veg, starting next grow lol
     
  2. #2 bongboi, Aug 11, 2011
    opinions will vary but lots of people flower with hps with a little blue in it so i would suggest full spectrum
     
  3. #3 thepreciouslamb, Aug 12, 2011
    Thanks man. Do you know if the glass from the Cool-tube blocks out the UVA/B light? Also, how would you suggest I add extra blue light?
     
  4. #4 theoryGV, Aug 12, 2011
    Full spectrum bulbs have both blue and red light I think sometimes there called dual arc bulbs
     
  5. #5 toastybiz, Aug 12, 2011
    The cool tube will absorb a little of the light, but you should be able to keep the light closer so you will more than gain back any light intensity lost to the glass.
     
  6. #6 thepreciouslamb, Aug 12, 2011
    Thanks for the info. I have some dryer duct going from the end of the cool tube, & out the grow closet. I keep the light about 5" from the plant tops, it never gets above 80f. I like to keep the plants short & bushy until I start flowering, then let them grow taller. They get tons of nodes & densely packed bud sites
     

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