High Pressure Sodium (HPS) Bulbs create light towards the red end of the spectrum so they are perfect for flowering and fruiting.
HPS lamps can be used throughout the development of plants too, but the distance between flowering sites will increase if this technique is used.
Most growers rely on Metal Halide (MH) for early development since plants require more light from the blue end of the spectrum during this time. This will decrease the spacing between flower sites meaning more flowers on each plant.
You should change to HPS when the plant starts to flower, as this will produce the best results.
|Watts||Lumens||Life||Lumen Watts||Recommended size|
|250||33200||36000hrs||130lm/w||0.6 – 0.7 m2|
|400||56500||36000hrs||141lm/w||0.8 – 0.9 m2|
|600||90000||32000hrs||150lm/w||1 – 1.2 m2|
|1000||130000||90000hrs||135lm/w||1.3 – 1.5 m2|
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