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US 9,804,024 B2Granted
Light measurement and/or control translation for daylighting
AssigneeMoJo Labs, Inc.
InventorMorgan Jones
Life of this patent
Estimating the term…
Abstract
Systems and methods are disclosed to translate a desired light level at a particular task location to a light level measured by a light sensor at a non-task location such as a wall location or a light switch location. For example, the light measured on the wall may be used to accomplish daylighting energy savings while maintaining a relatively constant illuminance value at the task location. Alternatively or additionally, up/down button presses at the wall location may be used to provide constant or consistent illuminance changes at the task location.
Claims16
A method for measuring the ambient task light level, the method comprising:
- measuring a first ambient light level at a first location within an architectural space at a first time;
- measuring a second ambient light level at a second location within the architectural space at a time near the first time, wherein the first location is different than the second location;
- determining a non-task-to-task efficiency translation from the first ambient light level and the second ambient light level;
- determining a third ambient light level at the second location at a second time, wherein the second time is different than the first time;
- and
- determining a light adjustment value for illuminating the first location from the third ambient light level and the non-task-to-task efficiency translation, wherein determining the light adjustment value is determined from:
- Ladjustment=Ldesired at first location−KLsecond location,
- where Ladjustment is the light adjustment value, Ldesired at first location is the desired light amount at the first location, K is the non-task-to-task efficiency translation, and Lsecond location is the second ambient light level at the second location.
5 more elements
A light sensor comprising:
- a photo sensor;
- a memory;
- and
- a controller coupled with the photo sensor and the memory, wherein the controller is configured to:
- measure a first ambient light level using the photo sensor at a task location within an architectural space at a first time;
- measure a second ambient light level using the photo sensor at a non-task location within the architectural space at a time near the first time, wherein the task location is different than the non-task location;
- determine a non-task-to-task efficiency translation from the first ambient light level and the second ambient light level;
- store the non-task-to-task efficiency translation in the memory;
- measure a total light level using the photo sensor at the non-task location within the architectural space at a second time, wherein the second time is different than the first time;
- determine a third ambient light level at the non-task location using the total light level;
- and
- determine a light adjustment value for illuminating the first location from the third ambient light level and the non-task-to-task efficiency translation, wherein determining the light adjustment value is determined from:
- Ladjustment=Ldesired at first location−KLsecond location,
- where Ladjustment is the light adjustment value, Ldesired at first location is the desired light amount at the first location, K is the non-task-to-task efficiency translation, and Lsecond location is the second ambient light level at the second location.
11 more elements
A method for determining the ambient light level at a task location, the method comprising:
- measuring a total light level at a non-task location;
- determining an ambient light level at the non-task location from the total light level at the non-task location;
- and
- determining an ambient light level at the task location from the ambient light level at the non-task location, determining a light adjustment value for illuminating the non-task location from the ambient light level at the task location and the non-task-to-task efficiency translation, wherein determining the light adjustment value is determined from:
- Ladjustment=Ldesired at first location−KLsecond location, where Ladjustment is the light adjustment value, Ldesired at first location is the desired light amount at the non-task location, K is the non-task-to-task efficiency translation, and Lsecond location is the ambient light level at the location.
2 more elements
A method for determining a light adjustment value for a light source, the method comprising:
- measuring a first light level at a task location;
- determining a first light delivery efficiency at the task location from the first light level;
- measuring a second light level at a non-task location determining a second light delivery efficiency at the non-task location from the second light level at a time near the first time, wherein the task location is different than the non-task location;
- determining a non-task-to-task efficiency translation from the first light delivery efficiency and the second light delivery efficiency;
- measuring a third light level at the non-task location;
- and
- determining a light adjustment value for illuminating the task location from the third light level and the non-task-to-task efficiency translation, wherein determining the light adjustment value is determined from:
- Ladjustment=Ldesired at task−KLnon-task,2
- where Ladjustment is the light adjustment value, Ldesired at task is the desired ht amount at the task location, K is the non-task-to-task efficiency translation, and Lnon-task is an ambient light level at the non-task location.
6 more elements
A method comprising:
- measuring a first total light level at a non-task location;
- storing the first total light level in a memory;
- measuring a second total light level at the non-task location;
- storing the second total light level in the memory;
- and
- in the event the second total light level is different than the first total light level, determining a light adjustment value for a task location from the second total light level, wherein the light adjustment value is determined from:
- Ladjustment=−Etask,2 C−ΔLnon-task,2, wherein Ladjustment is the light adjustment value for the task location, Etask,2 is the light delivery efficiency of a light fixture at the task location, C is a non-task-to-task ambient translation, and ΔLnon-taste,2 is the difference between the first total light level and the second total light level.
4 more elements
Dependencies are inferred from the claim text.