@hilde45
"Lighting (5–10%)"
I have mentioned, I designed Corporate Office Space for 40 years, When I came out of college, started working full time 1970, I was taught to calculate between 3-4 watts per sq. ft. to figure out how many light fixtures to plan for, in each office, room, large space. Of course you needed more AC for that. 2x4 fluorescent those days was 200 w per fixture.
Many rooms were 4 2x4s, I started using 3, stronger light at the desk area, let it be a bit less in the front by the entry.
Next, along came computers, which not only added heat, they used a good part of the panel for that floor. A period existed when you added new risers from Con Ed, new transformers, new panels, to handle the computer load, the ’extra’ AC and separate AC for computer rooms, that was a lot. Let;’s not forget big damn UPS (uninterruptable power supplies) for Computer/Network/Telephone rooms.
At the same time, HVAC engineers were getting ac from base building ducts from rooftop chillers, and providing many separate water cooled chillers, and then using re-heat coils to let the executives in offices adjust it.
NYC said ’no more water’; 'no more reheat coils'; then they had to refine their skills. I learned enough engineering to direct my engineers, because, it had to work well, but within a budget, I wanted more money below than above the ceiling.
I had lighting consultants, but after a while I did my own, including modified and custom fixtures, and generally providing light where needed, much less elsewhere, a pair of lights for artwork in generally dim corridors.
Next, I championed indirect light, both in rooms and open areas, big 400 watt metal halide, less energy, better lighting ...
I got pretty good at minimizing the lighting load so less add’l power was needed.
While planning Fortune Magazine, the Time Life Facilities director casually ended a meeting with, oh, btw, you only get 2 watts per sq. ft for lighting. My boss left shaking his head, sucking on his pipe, I liked the challenge, I ended up with 1.48 w/sf.
This is a long way of saying, when energy efficient lighting started, the fixtures, transformers for LED, kelvin colors of watt saver lamps SUCKED. I studied, decided it was better to provide good lighting, smartly planned than compromised crap.
Eventually better efficient lamps and fixtures came along.
Oh, btw, those 400 watt metal halide, in indirect boxes, had tempered glass covers. I found a bulletin from GE, they sometimes had ’non-passive’ end of life. What? Oh, explode, spewing 2700 degree molten glass. Combine that with the fact client’s facilities people were sometimes breaking and not replacing the glass, or replacing with window glass, so I stopped using them and sent out warning bulletins to all my clients.
Those bulletins were the beginning of my BOLD, underlined, italicized habit you see I can’t stop doing today.
