Adjusting interior lighting based on dynamic glass tinting

1. A method of controlling color of light in a room having one or more tintable windows, the method comprising:

determining a tint state for at least one of the one or more tintable windows using at least a clear sky irradiance value predicted to occur at a future time during clear sky conditions;

calculating a current internal color rendering index (CRI) value in the room using an external CRI value and the tint state of the at least one of the tintable windows;

using the current internal CRI value to determine one or more new settings for artificial interior lighting in the room, wherein the one or more new settings are determined to obtain a desired color of light in the room; and

sending control signals over a communication network to adjust the artificial interior lighting to the one or more new settings.

2. The method of claim 1 , wherein the one or more new settings are configured to provide a desired CRI value.

3. The method of claim 1 , further comprising determining whether to use one or more external sensors or one or more internal sensors for use in determining the one or more new settings for the artificial interior lighting.

4. The method of claim 1 , wherein the one or more new settings include one or more of

(i) selecting color or colors,

(ii) activating lights in one or more areas, and

(iii) selecting one or more light intensity levels.

5. The method of claim 1 , wherein each of the one or more tintable windows is an electrochromic window.

6. The method of claim 1 , wherein adjusting the artificial interior lighting to the one or more new settings is configured to obtain a contrast ratio in an occupancy region that is within an acceptable range or below a maximum contrast ratio.

7. The method of claim 1 , wherein the one or more new settings are configured to generate illumination from the artificial interior lighting with a first wavelength range complementary to a second wavelength range of light transmitted through at least one of the tintable windows in the tint state.

8. The method of claim 1 , wherein the one or more new settings for the artificial interior lighting are configured to generate illumination that in combination with light transmitted through at least one of the tintable windows in the tint state generates the desired color of light in the room.

9. The method of claim 1 , wherein the desired color of light in the room includes (i) wavelengths of red light, blue light, and green light or (ii) a spectral content of natural light.

10. The method of claim 1 , further comprising:

determining a new tint state for the one or more tintable windows; and

sending control signals over the communication network to adjust the one or more tintable windows to the new tint state;

wherein adjustments of the artificial interior lighting to the one or more new settings and the one or more tintable windows to the new tint state generate a combined illumination impinging a surface in an occupancy region, the combined illumination having (i) a spectral content of red light, blue light, and green light or (ii) of natural light.

11. The method of claim 2 , further comprising:

calculating the external CRI value using (i) measurements taken by one or more external sensors or (ii) the predicted clear sky irradiance value;

wherein the one or more new settings are configured to change the current internal CRI value to the desired CRI value.

12. The method of claim 2 , wherein the one or more new settings are determined using a current internal CRI value in the room and the current internal CRI value is determined using weather feed data.

13. The method of claim 2 , wherein the one or more new settings are determined using a current internal CRI value in the room and the current internal CRI value is determined using measurements taken by one or more internal sensors.

14. The method of claim 2 , wherein the desired CRI value is determined using historical data from user input.

15. The method of claim 2 , wherein the desired CRI value is determined from user input received at a wall unit or a remote control.

16. The method of claim 2 , further comprising:

calculating an external CRI value using the predicted clear sky irradiance value; and

transforming the external CRI value to a current internal CRI value using the current tint state of the at least one of the one or more tintable windows, wherein the one or more new settings are determined to change the current internal CRI value to the desired CRI value.

17. The method of claim 2 , further comprising:

determining a new tint state for the one or more tintable windows using the desired CRI value; and

providing instructions over the communication network to transition tint of the one or more tintable windows to the new tint state.

18. The method of claim 11 , wherein the one or more external sensors are part of a multi-sensor device mounted to a roof of a building comprising the room or on a facade of the building, including the one or more tintable windows.

19. The method of claim 11 , further comprising determining the predicted clear sky irradiance value using at least a calculated sun position and a window configuration.

20. The method of claim 13 , wherein the one or more internal sensors are located in an activity area of an occupant in the room during operation or at or near the artificial interior lighting.

21. At least one controller for controlling color of light in a room having one or more tintable windows, the at least one controller comprising:

a computer readable medium having control logic; and

circuitry in communication with the computer readable medium and with the one or more tintable windows,

wherein the control logic is configured to:

determine, or direct determination of, a tint state for at least one of the one or more tintable windows using at least a clear sky irradiance value predicted to occur at a future time during clear sky conditions;

calculate, or direct calculation of, a current internal color rendering index (CRI) value in the room using an external CRI value and the tint state of the at least one of the tintable windows;

using the current internal CRI value to determine, or direct determination of, one or more new settings for artificial interior lighting in the room, wherein the one or more new settings are determined to obtain a desired color of light in the room; and

send, or direct sending of, control signals to adjust the artificial interior lighting to the one or more new settings.

22. The method of claim 1 , wherein the tint state for at least one of the one or more tintable windows is determined based at least in part on the predicted clear sky irradiance value and a measured irradiance from one or more sensor readings.

23. The at least one controller of claim 21 , wherein the tint state for at least one of the one or more tintable windows is determined based at least in part on the predicted clear sky irradiance and a measured irradiance from one or more sensor readings.

24. The method of claim 22 , further comprising calculating the predicted clear sky irradiance value predicted to occur at a future time.

25. The at least one controller of claim 23 , further comprising calculating, or directing calculation of, the predicted clear sky irradiance predicted to occur at a future time.