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By R et al Kingslake

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Before a retrofit project, I have an email sent out to all workers, stating: • There will be a lighting upgrade. ”) • The new color tone will be more like daylight. ) • The new color tone is based on spectrally enhanced lighting, which is endorsed by the DOE as an excellent way to reduce energy, carbon footprint, etc. — Provide weblinks to the DOE. • If anybody does not like the new lighting initially, please keep it to yourself. • If anybody does not like the new lighting after two or three weeks, please let me know.

The company had suspended, totally indirect lighting fixtures. After I climbed up a ladder, the problem was very obvious. There was so much dirt on the bottom specular reflector that I could not even see the reflector. When I asked when was the last time the fixtures were cleaned, I was told never—and the building had been 18 Lighting & Controls: Transitioning to the Future built about 10 years before! After wiping off the thick dirt dust, the light levels were fine. I instructed the company to clean all of those fixtures throughout the building immediately, and that down the road, the fixtures should also be cleaned when lamps are replaced.

Parabolics helped, but now computer screens are flat and have anti-glare coating. The downsides of parabolic troffers are currently known: • Dreaded cave effect from dark ceilings and upper walls, which makes the space seem dark and smaller • 70-75% fixture efficiency • Lack of vertical footcandles • Overhead glare, which can cause eye strain and headaches Figure 7-3 shows one example of an office worker hating parabolic troffers. The maintenance person told me that it took two months to get this office worker to take down the tent.

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