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PAR, Lumens, Watts, etc



Here is data from "Proceedings International Lighting in Controlled
Environmets Workshop" 1994. Gerald Deitzer - "Spectral comparison of
sunlight and different lamps"

He gives two tables.  First is the spectral distribution for various lamps
sources. All of the values are normalized to 100 mkmol /(m^2*s) of PAR
(400-700 nm). Percetange are ampounts of photons relative to sunlight

                    UV            Blue   Green     Red     Far Red
Lamp+Barrier  250-350  350-400 400-500 500-600  600-700   700-750

Sun             2.88     6.21    29.16   35.20    35.64     17.00
   
Incandes.        0       0.47    7.52    28.49    63.98     47.00
100W + 1/8"               7%      26%     81%      180%      276% 
plexiglass

Cool White       0.03    1.11    24.85   52.59    22.56     1.40
1/8" plex.       1%      18%      85%    149%      63%       8%

Vita-Lite        0.54    2.32    26.31   40.69    33.0      7.0
                 19%     37%      90%     116%     90%       40%

Gro-Lux          0.16    3.72    29.36    20.22   50.42     1.01 
(original)        6%      60%     101%    57%      141%     6%

Gro-lux          0       0.83    19.78    32.52   47.70     10.00        
(Wide spectrum)           13%      68%     92%     134%     59%
+1/8" plex.

Cool WHite+      0.02    1.03    22.63    49.22   28.15     8
incandescent      1%      17%      78%     140%    79%      47%
(100W)
in a 1:3 ratio
+ 1/8" plex



all other lamps - HPS, Xenon, LED, etc.



Table 2 provides amount of energy in W/m^2 relative to number of photons of
PAR (400-700 nm) for each lamp. ALso, it allows to calculate illumination
level if you know PAR (mk mol /(m^2*s)). 

                  PAR/(W/m^2 per mkmol/(m^2*s))  Lux per PAR (mkmol/(m^2*s)) 
Sunlight                    0.22                        55.18     

Incandescent+1/8" plex      0.20                        49.00

Cool WHite + 1/8" plex      0.22                        78.75

Vita-Lite                   0.22                        62.78
 
Gro-Lux original            0.22                        37.02

Gro-Lux                     0.21                        55.09
(wide spectrum)+1/8" plex    

Microwave+1/4" plex         0.22                        67.43

CoolWHite+
100W Incandes.              0.21                        74.53
(1:3 ratio) + 1/8" plex



So.......cheap Gro-Lux is the same as expensive Vita-Lite (even better in
blue and red regions). And combination of CW+incandescent is good also (you
can find similar data in Philips Lighting Handbook)


Enjoy. 


Michael, who design wierd shit around wierd lamps for living