High Pressure Sodium Bulbs

Brands/Manufacturers may vary depending on availability.

• High Pressure Sodium lamps with clear tubular outer bulb, high output and long reliable lifetime
• High Pressure Sodium lights produce an orange/red spectrum and is best for flowering plants.
• The orange-red light stimulates plant hormones and encourages it to flower.
• The best way to light your grow room is with a combination of blue and red/orange light, to keep plants compact and flowering happily.
• This is best done by starting with a Halide then changing to a High Pressure Sodium for flowering or by using a multi-spectrum lamp.
• Plant growth (photosynthesis) is not then determined by lux or energy, but by the photons from the blue to red (400–700 nm) part of the spectrum.