Today is
Home  |  About us  Agency Service  Letter to You  |  Benefits for You
     Induction lamp
Down Light Series
Explosion-proof Light Series
Flood Light Series
Garden Light Series
Gas Station Light Series
High bay Light Series
Street light Series
Tunnel Light Series
    Products Description
Measuring Lumens
-----What Are "Pupil Lumens"?
LVD Theory Parameters
Energy Comparison
Electrodeless lamp wikipedia
Compared with Fluorescent
Compared with high frequency induction lamp
Compared with HPS HPM MHL
Compared with LED
    LVD Theory & Parameters
Table 1. Conversion factors for lumens to pupil lumens
Correction factors applied to conventional values of lumens per watt yield a value for pupil lumens per watt, which is a measure of how effectively the eye sees the light that is emitted. The pupil is more receptive to light at the blue end of the spectrum.
Light source Conventional lumensper watt Correction factor(P/S ratio) Pupil lumens perwatt
Low-pressure sodium 165 0.38 63
5,000-K T5 fluorescent 104 1.83 190
4,100-K T8 fluorescent 90 1.62 145
Clear metal halide 85 1.49 126
5000-K LVD Lamp 80 1.62 129
5,000-K pure triphosphor fluorescent 70 1.58 111
3,500-K triphosphor fluorescent 69 1.24 85
50-watt high-pressure sodium 65 0.76 49
2,900-K warm white fluorescent 65 0.98 64
Daylight fluorescent 55 1.72 95
35-watt high-pressure sodium 55 0.57 31
5,000-I 90 CRI fluorescent 46 1.7 78
Vitalite fluorescent 46 1.71 79
Deluxe mercury vapor 40 0.86 34
Standard incandescent 15 1.26 19
Tungsten halogen 22 1.32 29
Recent studies seem to favor white light (as from induction lamps) for viewing moving objects in low-light conditions, such as spotting a pedestrian, animal, or other moving object off to the side of the roadway at night. Some cities opt to use white light rather than the yellowish light of high-pressure sodium (even though the price is higher) in hopes of reducing accidents. The improved color rendering of white light in retail areas and places where people congregate after dark make it a popular choice for street lighting in downtown areas.
Induction lamps produce high quality white light. More lamps and fixtures are becoming available, but they do carry a premium price and still have limited applications. The long life of these lamps can substantially reduce maintenance costs due to relamping.
White light is proving to have advantages for visual performance. Current codes and standards are based on measurements that do not address the impact of pupil lumens, and pupil lumens can be quite different from traditionally measured lumen output of lamps. Studies on the relevance of light spectrum and the mechanics of vision are ongoing, and codes and standards may reflect that in the future.
Total  2/3  Pages    First  Prev  Next  Last
Copyright  2001 LINAN EURO-CHINA Co., Ltd. Last modify: 09.18.2004 Questions about our products,
please send e-mail to
TEL: +86-571-63726372  Mobile:+86 13216144789   FAX: +86-571-63726372  MSN Messenger:
ICP NO.: 05081080#