Recalibration of a tunable lamp system

1. A tunable light module, comprising:

a memory storing a color mixing plan;

a lamp of a color;

a light sensor configured to measure a light characteristic of the lamp; and

control circuitry configured to:

drive the lamp to produce a colored light according to the color mixing plan that corresponds to a correlated color temperature (CCT);

cause the light sensor to measure a light characteristic of the lamp;

detect a degradation level by comparing the measured light characteristic against an expected light characteristic stored in the memory, the expected light characteristic being part of the color mixing plan;

adjust a current level for driving the lamp at the CCT by referencing the color mixing plan and an alternative coefficient corresponding to the degradation level; and

in response to determining that the detected degradation level has no pre-computed alternative coefficient saved in the memory, interpolate between alternative coefficients associated with nearby degradation levels proximate to the detected degradation level to derive the alternative coefficient used to adjust the current level,

wherein the color mixing plan specifies a driving condition for the lamp to achieve a color characteristic at a particular operational temperature.

2. The tunable light module of claim 1 , wherein the alternative coefficient is pre-computed, part of the color mixing plan, and stored in the memory, and

wherein the alternative coefficient is associated with the detected degradation level prior to deployment of the tunable light module.

3. The tunable light module of claim 1 , wherein the light characteristic is brightness of the colored light.

4. The tunable light module of claim 1 , further comprising:

computing the alternative coefficients for the color mixing plan for the degradation level; and

storing the alternative coefficients in the memory prior to deployment of the tunable light module such that the tunable light module is capable of being calibrated after the deployment.

5. The tunable light module of claim 1 , wherein the color mixing plan is a lookup table that maps correlated color temperature to driving current levels or output flux requirements for the lamp, and

wherein the driving current levels or the output flux requirements are represented by the alternative coefficients.

6. The tunable light module of claim 1 , wherein the color mixing plan is a polynomial function that takes a correlated color temperature as an input and provides driving current levels or output flux requirements for the lamp, and

wherein the alternative coefficients are coefficients of the polynomial function.

7. A tunable light module, comprising:

a lamp of a color;

a memory storing a color mixing plan specifying a driving condition for the lamp to achieve a color characteristic at a particular operational temperature;

a light sensor configured to measure a light characteristic of the lamp; and

control circuitry configured to:

drive the lamp to produce a colored light according to the color mixing plan that corresponds to a correlated color temperature (COT);

cause the light sensor to measure the light characteristic of the lamp;

detect a degradation level by comparing the measured light characteristic against an expected light characteristic stored in the memory; and

adjust a current level for driving the lamp at the CCT by referencing the color mixing plan and an alternative coefficient corresponding to the degradation level,

wherein the color mixing plan maps operational temperature of the lamp to one or more driving conditions.

8. The tunable light module of claim 7 , further comprising:

a temperature sensor configured to measure or approximate the operating temperature of the lamp.

9. The tunable light module of claim 7 , wherein the control circuitry is further configured to retrieve the alternative coefficient from the memory.

10. The tunable light module of claim 7 , wherein the control circuitry is further configured to:

determine that the degradation level does not correspond to any pre-computed alternative coefficient stored in the memory;

retrieve a pair of pre-computed alternative coefficients from the memory, the pair of pre-computed alternative coefficients comprising:

a first pre-computed alternative coefficient corresponding to a next highest degradation level; and

a second pre-computed alternative coefficient corresponding to a next lowest degradation level; and

deriving the alternative coefficient by interpolating between the pair of pre-computed alternative coefficients.

11. The tunable light module of claim 7 , wherein the control circuitry is further configured to store the alternative coefficient in the memory.

12. A tunable light module, comprising:

a lamp of a color;

a memory storing a color mixing plan;

a light sensor configured to measure a light characteristic of the lamp; and

control circuitry configured to:

drive the lamp to produce a colored light according to the color mixing plan that corresponds to a correlated color temperature (COT);

cause the light sensor to measure the light characteristic of the lamp;

detect a degradation level by comparing the measured light characteristic against an expected light characteristic stored in the memory;

adjust a current level for driving the lamp at the CCT by referencing the color mixing plan and an alternative coefficient corresponding to the degradation level;

generate a spectral profile based on the colored light produced by the lamp as measured by the light sensor; and

transmit the spectral profile to a server across a network.

13. The tunable light module of claim 12 , wherein, upon receipt of the spectral profile, the server is configured to:

realign a color space map associated with the lamp, the color space map comprising test data for the lamp prior to deployment of the tunable light module;

update the color mixing plan based on the realigned color space map by optimizing the color mixing plan against a set of performance metric constraints on illumination produced by the lamp;

send the updated color mixing plan to the tunable light module.

14. The tunable light module of claim 12 , wherein the causing the light sensor to measure the light characteristic of the lamp comprises monitoring the spectral profile of the lamp using the light sensor,

wherein the detecting the degradation level comprises detecting a degradation in the lamp based on the spectral profile, and

wherein, due to the degradation, the tunable light module is unable to produce illumination with the lamp at the CCT that satisfies a set of performance metric constraints of the illumination according to the color mixing plan.

15. The tunable light module of claim 14 , wherein the control circuitry is further configured to:

send the spectral profile to an external device for delivery to a cloud server; and

receive an updated color mixing plan back from the cloud server,

wherein the tunable light module is able to produce illumination at the CCT that satisfies the set of performance metric constraints according to the updated color mixing plan.

16. The tunable light module of claim 14 , wherein the performance metric constraints comprise illumination efficiency, illumination efficacy, color rendering index, maximum lumens, or any combination thereof.

17. The tunable light module of claim 12 , wherein the light sensor is a tristimulus sensor or a spectral analyzer.

18. The tunable light module of claim 12 , further comprising a communication interface capable of sending a wireless signal to a mobile device that has a network connection to a cloud server, and

wherein the communication interface is configured to embed the spectral profile in the wireless signal that is designated with a destination at the cloud server.