I know that there are LPD design values given by space types in ASHRAE standards 90.1 and 189.1, but is there another resource for state-of-the-art lighting design by space type that goes beyond those efficiency levels?
At the risk of sounding like a dick, resources for "state-of-the-art lighting design, by space type, that go beyond (ASHRAE standard) efficiency levels" are called "Architectural Lighting Designers", and they can be found practicing this blend of art and science world-wide.
In all seriousness, lighting design efficiency can be boiled down to a couple of simple metrics such as LPD, but when it comes to really getting aggressive one must use caution to ensure that the other goals of lighting design are not compromised. Issues such as contrast, task illuminance, uniformity and (gasp!) aesthetics are all part of the equation, and cannot be fully understood by simply multiplying the number of luminaires in the space by their load. These other issues are a product of the luminaire distribution, the volume, and the materials within it. ASHRAE and the folks at PNNL do a good job of making sure that with each proposed LPD reduction in the standards, there are multiple ways to meet those goals, in terms of luminaire selection and layout. But when really pushing the boundaries, it takes a little bit of design and investigation to ensure that the lighting is serving the needs of the building occupants.
I have seen new construction incentive programs that reward based on incremental 0.1 W/ft2 improvements over the 90.1 (or IECC) values.
I think it will be difficult to find too many general references for "state of the art" that provide a fixed LPD value, since the selection of an advanced technology may be specific to the space type, owner, etc.
Your best bet may be to look for a similar case study in High Performance Buildings Magazine, or other repository of case studies for specific buildings.
For aggressive lighting power reductions, it's not a question of "state of the art" but rather what are the lowest illuminance levels an owner will consider acceptable, while also deemed satisfactory to occupants on multiple levels of visual and functional experience. Current technologies are a fairly level playing field and you can't say for certain that deploying technologies X, Y, and Z will give performance A.
In addition to "how low can you go" it's also a question of where each criteria is deemed necessary, either as a blanket of uniform light across entire spaces, or if limitation of enhanced lighting at particular work areas will be accepted.
I agree with a previous response (although I'm admittedly biased) that verification of targets by a lighting designer are the only way to determine a project specific answer.
Asked: 2014-10-31 16:31:44 -0600
Seen: 791 times
Last updated: Aug 21 '15
