SUPPLEMENTAL LIGHTING

hps lamp

High-Pressure Sodium 

  • Most commonly used
  • Produces light in the orange-red spectrum (supports flowering and fruiting)
  • Relatively inexpensive
  • Inefficient conversion rate (30% of electricity into usable light), the remaining is emitted as heat
LED lights

LED

  • Produces light by passing an electrical current through semiconductor material
  • Up to 80% less energy than HPS
  • Produces 90-130 Im/W and converts 80-90% of the electricity used into PAR
  • Because of low heat loss, they can be placed closer to plants
plasma lamp

Plasma

  • Produces light by activating plasma through radio frequency emissions
  • Full spectrum sunlight
  • Produces 140 Im/W, and 93% conversion rate of electricity into useful light
  • Long life- 100,000 hours
  • Expensive
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