I ran your room through my lighting software program. The reflectance
values were standard 80-50-20 which equates to white ceiling, tan -
light painted walls and concrete floor. Mounted at 10'
To achieve the following use - 4' - T8 strip fixtures
30 average foot candles you'll need 6 at 4' - 2 rows of 3
40 average foot candles you'll need 9 at 4' - 3 rows of 3
50 average foot candles you'll need 12 at 4' - 4 rows of 3
I'd go with 841 lamps. They cost a bit more but they like all
fluorescent lamps will last as follows
30,000 hours with 12 hour starts and 24,000 hours with 3 hour starts.
The 8 stands for 80+ CRI - Color rendering - The higher the color
rendering the more a color looks like it should. Sunlight and an
incandescent lamp have a CRI of 100. They encompass all the spectrum
A higher CRI lamp will in a sense contain more of the light 'spectrum'
The X41 stands for 4100 Kelvin. An incandescent lamp is about 2700K.
The higher the Kelvin the whiter and actually bluer it looks. For the
older generation. A higher Kelvin is better due to visual acuity and
the aging of eyes. Also the higher the Kelvin, studies have shown the
lower amount of light is needed. If your wondering what the heck does
30 foot candles look like. If you work in an office its engineered at
30Fc, A hallway is at 10Fc. A parking garage is 5Fc. A Gym is 30Fc.
If you'd like, Send me an Email and I'll send over the lighting
layouts for you.