|
PROLOGUE
Please note that this is the second part of a two-part series on Home Lighting Design For Aging Eyes - this and the first part, on The Basics at http://searchwarp.com/swa124510.htm.
[Hang on mathphobes, this stuff boils down to one number times another number equals a third number - like 2x6=12, like – like that you can take to a lighting professional who can deliver the illuminance goods]
RECAP
In Part 1, we were presented with a set of rules and restrictions for home lighting design for aging eyes in order
- To achieve home lighting design standards more suitable to aging eyes (which the literature allows begin to need extra light in their 40s)
- To translate these new home lighting design standards into numerical targets of common metrics readily identifiable in the retail lighting marketplace
- lpW (lumens/Watt, see Part 1 for variables' definitions) data have been around quite a while
- CRI and CCT data were hard come-by up until the last few years, as fluorescent makers “warmed up" their bulbs, and, particularly, their compact fluorescent lamps, or CFLs
EXAMPLE
Comment: OK, let’s try on an example.
- A bedroom has an ambient fc target value of 40, i.e., 40 lm/ft2. That’s a given
- The bedroom we’re targeting in this example is, say, 200 ft2 in floor surface area
- 40 lm/ft2 multiplied by 200 ft2 = 800 l, our lumen target
- This house designer is not immediately, if at all, interested in that with which the space gets lighted (noting that method will be specified in the plan set, but rarely materials)
- except that it be lighted evenly
- not interested in specific luminaires –
- immediately, interest is in determining lumens for given spaces
- eventually, choosing among materials is for the knowledge of lighting pros and interior decorators and the personal sense of clients, etc.
Comment: Again, it’s the lumen number for a space coming from the Rules that bridges the gap between your lighting interests and intentions and the folks who know a lot about lighting but not a lot about you. At its easiest, bring your lighting professional the Rules – The Basics and The Math – and the plan set.
NIGHTLIGHTING SCHEDULE
These calculations end up in a home lighting design Nightlighting Schedule defining by-level and by-space fc target, actual square feet, lm target, and distinction of task or ambient. Some spaces are necessarily scheduled in more than one line when, for example, task illuminance target varies from, say, shower to vanity – both for different target levels and square footage.
Nightlighting Schedule, Excerpted Table
.jpg)
Comment: It’s labeled “Nightlighting" to oppose it to a “Daylighting" Schedule of natural illumination to interior spaces – separate subject. Nightlighting and Daylighting can interrelate – yet, another subject in residential lighting design.
NIGHTLIGHTING NOTES
A home lighting design Nightlighting Schedule can be presented with extensive notes, including
- Selected types of luminaires indicated, in order to keep perspective broad
- Certain materials preferred, e.g., brilliant reflectors to get the maximum illuminance out of CFL downlighting
- Rules of artificial, or mechanical, illuminance design repeated as a fall-back reference
- Methods emphasized, e.g., layering, dimmers, under-cabinet skirting, etc.
- Materials are recapped, e.g., pendant, sconce, cove, etc.
- Lighting quality hurdles indicated
- Site-specific concerns identified, e.g., about lighting potentially high-hazard spaces, possibly troublesome glare, cold-weather fluorescent materials and methods, safety-switching, continuous service rating, etc.
Nightlighting Schedule, Excerpted Notes
.jpg)
ELECTRICAL & LIGHTING PLAN - PARTIAL PLAN VIEW
- The home lighting design Nightlighting Schedule and related notes get translated in the Electrical & Lighting Plan in plan view,
- This is not about beating a dead horse
- texted table
- extensive notes
- now a floor plan expression of wiring including lighting
- whew
- This is about taking the wiggle-room out of residential lighting design and installation in application
- let the designing be done by designers guiding clients
- then let the installation, the construction begin
Let’s inspect a recent drawing of a Masters Bath lighting design drawing, for conformity to our lighting standards herewith and overall
Electrical & Lighting Plan, Partial Plan View
.jpg)
- All but 2 switches are coded “D" for dimmer, for infinite control
- Height above floor level defined for switches (and receptacles)
- The 2 switches not dimmers are purely for task use in the bog room
- The switch between bath and bed (space to the left and above) is coded “L" for lighted for convenience and safety as would-be paths from Masters to kids’ beds and to Kitchen
- Vanity lighting is, for least-shadowed illumination –
- properly set usually at 66 linear inches over finish floor level and
- luminaires are spaced 30 linear inches apart, centered over the lavatories
- The Masters’ walk-in Closet switch is pressure-sensitive, relieving excess visual and physical distraction in moving between spaces
- fc is identified by space, value, and type – lest one forget the Nightlighting Schedule which is duly cross-referenced
- Distinction is clearly made that luminaires are illustrative, i.e., final choices of luminaire types, numbers, and sites are to be done by others whose day job it is to do so
- Centerlines are depicted for certain lighting groups, because the author has abundant experience in observing how cockeyed some luminaires get applied when left to installers
|
