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HPS Grow Lights

High Pressure Sodium (HPS) Grow lights

– High pressure sodium marijuana grow lights are another good choice however they emit a light that is stronger in the orange / red spectrum, around 2,200k, due to their inherent sodium content. If a gardener were to start a young plant under a HPS bulb, she/he would see impressive vertical growth.

Not only is this a great flowering light, it has two features that make it a more economical choice.

  1. Their average lifespan is twice that of metal halides, but after 18,000 hours of use or 12 to 18 months, they will start to draw more electricity than their rated watts while gradually producing less light because they will require more energy to maintain the gas inside. HPS bulbs are very efficient.
  2. They produce up to 140 lumens per watt.

HPS grow lights operate and emit light when an electrical current flows through ionized gas or plasma. They usually require some time to heat up and an electronic system known as a ballast (big heavy thing) is required as a type of resistor. The ballast regulates the electrical current flowing through the circuit. When the ballast cannot supply enough voltage it will begin to shut down as the pressure of the tube reduces. Time to get a new bulb.

HPS grow lights emit a huge amount of heat – just imagine a 1,000 watt heater in your room, it will produce similar heat – and HPS grow light heat is radiant and directed straight onto your plants. You will need to have a large gap between your lights and the plants. Smaller wattage systems (100 W and 250 W) should be hung about 2 – 3 feet from the top of the plants. Medium wattage systems (400 W and 600 W) should be hung around 4 feet from the top of the plants. High wattage systems (1000 W and up) should be placed say 4 – 6 feet from the plant tops. You might need to look into the cooling of the grow room.

The HPS grow light is not very good for the growth phase but better for the flowering phase as they are deficient in the blue spectrum. The best bet is to use a MH grow light for vegetative growth and then a HPS for the flowering stage.

Metal Halide (MH Grow Lights) – A type of HID

MH grow lights – Metal halide marijuana grow lights primarily emit light in the blue spectrum which promotes excellent photosynthesis and therefore green vegetative growth. Blue light also keeps plants more compact, it is the closest thing to real sunlight. If you are going to use just one light this is a good compromise.

The average lifespan is about 10,000 cumulative hours. The bulb will light up beyond this time but due to the gradual decline of light, it is not worth your while to wait for the bulb to finally burn out. If you compare their lumen (brightness) per unit of energy consumed metal halide grow lights produce approximately 65 to 115 lumens (brightness) per watt of energy consumed versus a normal incandescent light bulb which produces between 15 and 35 lumens per watt.

MH grow lights also come in a ‘super’ format; if you can find a ‘super MH’ they will produce around 15% more lumens. More yield!

Marijuana grow light overview

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HPS Grow Lights, 9.3 out of 10 based on 3 ratings

From the forum

How to Grow Marijuana Forum - Growing Marijuana Indoors & Hydroponics

28 thoughts on “HPS Grow Lights

  1. Can someone help me how good will 3 plants flower under a 1000 watt hips lamp in a 4 by4 room

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  2. hey out there im using 1000 watt hps system im wondering what the ideal space would be to go with?? ie 3ftx3ft or more or less?? with the basic barn roof style shades

    thanks; Dave

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    • hi Geoff, I was wondering i bought a pluto HPS and electronic ballast i’m unsure with the setting it start 400 goes up to 1000 what watts do I set for veggetation

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  3. Hi John, That will work just fine. Why not consider, when you switch to HPS, using the CFLs on the lower reaches of the plants to maximize light penetration. This will increase bud production from lower budding sites and will be easy to do as you already have ther CFLs in place.

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  4. can u just use fluorescent lights for the baby stage and then when it grows about a foot tall just switch to hps for the rest of the cycle??

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  5. Good move,as long as there is more red spectrum in h.p.s.
    Blue for grow , red for bud.

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  6. Im confused just started flowering stage and took out my 400 watt metal halide bulb and put in 400 watt high pressure sodium bulb is this the right move

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  7. eym knot noobie gro-er, i been have gro-un lotz uv plant b 4. but ey hav nevr had 2 feeyd em b 4 now ppeeps say shud feeyd, but wut du tha eeet?

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  8. u can buy them off the net or ur local hydrponic store/shop,ur best getting every thing from a hydro store/shop,garden centers are just no good there soil is crap an u cant even buy mh/hps frm most of em in fact i dont no any that sell mh/hps lights,get it all off the web mate
    theres 1000’s of hydroponics web sites all after ur money an all with there own little set up deals,search round 1st b4 u buy i found a 600w shade,buld an ballest for just £60/$45 an that well cheap to most of em on the web also try e-bay loads on there as well

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  9. Using digital ballasts coupled with lucagrow H.P.S. for grow and flower.
    Have heard that M.H.lighting in the last 2 weeks increases resin production.
    Fact or Fallacy

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  10. as far as i know mate if you plant it outside in spring it will grow if conditions are good, soil and all,.

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  11. OG Grow since 1992

    I’ve used everything from florescent to enhanced HPS and I can tell you right now, for growing pot, stay with the 140K lumen standard HPS 1000 watt bulbs from GE or Sylvania (for indoor growing). You won’t see any difference in your veg using metal halides because as soon as your plants reach 8-14″ you will go to flower anyway. The increased vertical growth is a benefit to getting your plants on 12/12 faster than working with a bluer light. And no, the stems won’t be weak and no elongation will not be any problem, unless you are growing a leggy strain of pot. The price is half as much per bulb. Listen people–the enhanced HPS bulbs are “enhanced” in the blue spectrum, This does NOTHING for flowering. Save your money and buy the standard 100wt HPS bulbs that put out 140K lumens. Done.

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  12. Prices of these bulbs varies quite a bit, depending on the watts of the bulbs and brands. 250w 400w 600w and 1000w are pretty much what you can find on market. Choose the right type of bulbs base on how big the area of growing is. Prices for 400w hps/mh bulbs can range from $20 to $100+, 1000w usually starts $30 and can run to mid to high $100. If you are to power both of these bulbs, you need a switchable electronic ballast, which can power both of the bulbs without trouble. Then you need a reflector or hood or tube to improve the efficiency.
    A typical setup including a 400w switchable digital electronic ballast, two bulbs, a bascic reflector can range from $140 to over $300 depending on the brand you choose. If you need more info, checkout other pages on this site or email me at law.tan@gmail.com

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  13. plants are 5 weeks old using mh bulb they are foot and a half tall when do i switch to hps light

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  14. my plants are 5 weeks old some of them are a foot and a half and some are 12 inches using 1000 watt metal halide when do i change hps bulb

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