How to change seasons definition
DL-Light offers calculation of daylighting indicators for periods of time.
Periods can be predefined seasons or custom specified with custom limits.
Seasons limit dates in DL-Light are configured by default for northern
hemisphere, but can be modified for other context. Seasons' limit dates are
shown in tooltips.
The definition of seasons can be changed in preferences:
The provided season files are in the folder
/Users/[user name]/Bibliothèque/Application Support/SketchUp
These files can be edited with TextEdit
All future calculations will use new season definitions and dates. Note that
old results with old seasons should recalculated for new seasons.
Custom period definition
Custom period can be defined in several ways:
Full days: define start and en dates. The period covers the date
range, end date included, with full days from 0h00 to 23h59.
Hours per day: define start / end limits for dates and hours. The
period covers the date range, end date included, only hours between the
start / end hours range are used.
A hour range ending with 'HH : 00' will be automatically translated
to 'HH-1 : 59' during the computation, thus the range '12:00 - 14:00'
means 'two hours from 12:00 to 13:59'.
Start / end: define start date with hour, and end date with hour.
The period covers the range from start to end limits.
A range of '2017-01-01 12:00' to '2017-01-02 20:00' covers 1 day and
8 hours, 12 hours from 12:00 to 23:59 the first day and 20 hours from
00:00 to 19:59 the second day.
Complex: use a complex definition of period. (Sun Exposure and
Watt extensions.) The period is a list of "hours per days" time slices defined in
the preferences. Each line contains 8 numbers to define a time slice:
start month, start day, end month, end day, start time hour and minutes,
end time hour and minutes.
Default value are:
Boundaries are included in the time range. There is no limit to the
number of lines. Time slice must not overlap the new Year's Day, if a
period from 15 December to 15 January is needed, just put 2 lines, 15 to
31 December and 1 to 15 January. Complex period is the sum of the time
slices. Note that hours are defined in winter time zone, never DST.
- 1st of March to March, 31 from 10h to 17h,
- 1st of April to September, 30 from 9h to 16h,
- 1st of October to October, 31 from 10h to 17h,
Time step The time step for calculations is 1 hour, but for SunExposure
calculation with clear sky it can be set to value lower than 60 minutes.
The Daylight Autonomy extension uses a
more detailed occupancy profile feature, thus
only the 'Full days' mode is available for custom period.