e57 said:
Oh and someone PLEEZE.... Tell me there is no "magnetic field survey" or anything like that involved?
Okay, there is no magnetic field survey required by LEED. I've only heard of magnetic fields being a concern in hospitals. But I've never been asked even there for a survey.
LEED energy requirements are based on ASHRAE 90.1. The only real power requirements are to limit voltage drop to 2% for feeders and 3% for branch circuits.
The lighting requirements can get details. When you do power density calcs use the ballast/lamp combo for the wattage. But incandescent wattage is based on maximum socket rating. So a screw in compact fluorescent lamp in an incandescent socket has to be counted as the socket rating. Some manufacturers will provide a lower wattage UL label if requested.
Task lighting does not have to be LED but it does have to be included in the power density calcs. Those little quartz lamps are energy hogs and LED might be preferable.
Interior lighting in buildings larger than 5000 sq. ft. require automatic control devices to shut of lighting in all spaces. Meaning occupancy sensors or timed controls. Sensors are allowed up to 30 minutes for shut off. There are a few exceptions for 24-hour use and patient care.
Dimming is not required but daylight harvesting may help in the annual energy use calcs. If you're aiming for tax savings with EPAct 2005 then it requires bi-level switching in all spaces with few exceptions.
Accent and Display case lighting requires a separate control device. Task lighting needs an integral or nearby wall mounted control device. Hotel and motel guest rooms requires a master control device at the main room entry to control all permanently installed luminaires.
Exit signs are limited to 5W per face.
If you're counting the floor area for the space by space calc method then measure from the centerline of the walls. They use the word "partition". This way the space by space method and the whole building method has the same total square footage. And use the extra wattage allowances available for accent lighting and rooms with computer monitors. These extra allowances are not transferable to other spaces but they can help alot.
I don't know where the 2007 Title 24 will stand compared to ASHRAE 90.1. The most recent versions of LEED reference ASHRAE 90.1-2004. The next revision of LEED will probably reference ASHRAE 90.1-2007. But they haven't done that yet.
That 14% less energy use than Title 24 was for the 2005 version. That was from the link I provided. But if you follow Title 24 then you're still required to comply with the other provisions of ASHRAE 90.1.
These energy models are too expensive in my opinion. I wish there was an alternative compliance path. Not likely now that they require 2 points on this credit.
The light polution reduction credit I dislike. I've tried to get them to revise it but no luck. Version NC 2.2 does not limit you to full cutoff luminaires. They just limit the total initial uplight for the whole site. The amount of uplight is dependant on whether the building is in a rural zone or urban zone. My biggest complaint with this credit is they limit the amount of light trespass to 0.01fc at 10'-15' past the property line. This is measured at eye level or 5' above grade. If anyone has ever done a lot of site lighting calcs you know how far 0.01fc can be from the light source. For those who don't do lighting calcs, the full moon is about 0.03fc.