How good is a 400w HPS Grow light

Discussion in 'Lighting' started by jayjay5396, May 11, 2011.

  1. How many plants will it grow in a closet

    ok i know there is 1000w bulbs out there but is 400w any good
  2. 400w is fine if the yields from a 400w are acceptable to you. 1000w will produce higher yields, but it would also be harder to cool.
  3. Since most plants can be grown at a variety of sizes, there's no set number of them that fits under a given wattage lamp. A 400w supports strong growth in about 2.5"x2.5" of floor area and about 3' from the bulb. How many plants you grow inside and outside of that space is up to you.
  4. thanks how long should i leave the light on i got 2 baby plants under it now the plants are just starting to grow there very first leaf only a week old or something
  5. 24 hours of light for veg, or you can do 18/6, or like my buddy and do 20/4

    but he just upgraded from flowering with 6 four foot fluorescent tubes to one 400W HPS, could literally tell a difference within a day or two, some of the plants just exploded with new growth on the nugs

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