caron 6540 - B - Light Intensity Characteristics

6540 Series Operations Manual Rev_I 1/12/2016 61
APPENDIX B –LIGHT INTENSITY CHARACTERISTICS (REFERENCE ONLY)
Light intensity nomenclature
Near UV
Visual
Abbreviation
UVA
VIS
Lamp type
Black
Cool white
Wavelength
320 – 400 nm
400 – 800 nm
Intensity units
W/m
2
lux (or klux)
Exposure (dose) units
W-hr/m
2
lux-hr (or klux-hr)
ICH Q1B confirmatory requirement
200 W-hr/m
2
1.2 million lux-hr
or 1200 klux-hr
Photopic (visual light) conversions
1 klux = 92.9 foot-candles (fc)
13.5 μmol/m
2
/s (for cool white fluorescent only)
Light intensity and lamp age
The life expectancy of a fluorescent lamp varies significantly by the operating condition in which it is used. Under
ideal conditions, maximum light intensity decreases with lamp age as shown below. Other factors influencing lamp
life includes chamber air temperatures (optimal at 25ºC), number of on/off cycles, and amount of light dimming
applied. For optimal performance, CARON recommends lamp replacement every 2000 hours.
Optimal Fluorescent Lamp Output
80
85
90
95
100
0 1000 2000 3000 4000 5000
Operating Hours
Intensity, % of Initial