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LED lighting HPS Vs. LED
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JINHUA SUNMASTER SOLAR LIGHTING CO.,LTD
to JINHUA SUNMASTER SOLAR LIGHTING CO.,LTD
Scientific facts Scientists at the Lawrence Berkley Laboratory (LBL) developed the
concept of scotopic lumens. They developed a factor called P/S ratio. This ratio helps convert traditional Lumens into actual lumens perceived by the eye under mesopic light conditions and gives a more accurate estimate of the amount of light.
Pupil Lumens = Photopic Lumens * [S/P] 0.78 Here are some types of lights with their traditional and pupil lumens
Source of Light Watt Lumens
Lumens/Watt (Photopic Lumens)
S/P Ratio (correction factor)
Pupil Lumens
Pupil Lumens/Watt
Low Pressure Sodium
250 32500 130 0.2 9250 37
High Pressure Sodium
365 37000 101 0.62 25530 70
Metal Halide 455 36000 79 1.49 48960 108
T8 Fluorescent (3000 K)
36 2800 78 1.13 3080 85
LED Light 15 1500 100 1.9 2475 165
• LED S/P ratio is about 3 times higher than it is for HPS.
• A good general idea of what wattage of LED will replace an equivalent HPS wattage , is to divide the HPS wattage by 3.
Source: Berman, S.M., (1995), The Reengineering of Lighting Photometry, Lawrence Berkeley National Laboratory.
Each point represents successful projects where HPS lighting fixtures were replace with LED fixtures.
SunMaster
Some examples
250W HPS system 60W LED system
110W HPS system 30W LED system
Lumen output is not the only parameter that should be taken into account when replacing HPS fixtures with LED fixtures
6935 lumens Color temperature : 2000K (Yellow)
21000 lumens Color temperature : 2000K (Yellow)
6240 lumens Color temperature : 6500K (Pure white)
2880 lumens Color temperature : 6500K (Pure white)
