Patent ID: 8593082

Claim:
A color temperature adjusting system, comprising: a setting unit configured to generate signals including a desired value CCT for a correlated color temperature in response to a user's operation; a light emitting diode (LED) unit comprising a first LED module and a second LED module which has color temperature different from that of the first LED module, wherein the color temperature of the first LED module is lower than that of the second LED module; a processing unit comprising: a storage module configured to store a table recording a relationship among a number of coefficient values X, first current values I 1 of current flowing through the first LED module, and second current values I 2 of current flowing through the second LED module; a calculating module configured to apply one or more formulas for calculate the coefficient value X by comparing the desired value CCT with a threshold value CCT(0), and calculate the coefficient value X according to the applied formula; an executing module configured to determine the first current value I 1 and the second current value I 2 according to the coefficient value X produced by the calculating module and the table stored in the storage module; a constant-current drive unit comprising: a first drive module connected to the first LED module, configured to generate a first modulated signal to adjust the amount of the current flowing through the first LED module to equal the first current value I 1 as determined by the executing module; and a second drive module connected to the second LED module, configured to generate a second modulated signal to adjust the amount of current flowing through the second LED module to equal the second current value I 2 as determined by the executing module, thereby adjusting the color temperature value of the overall LED unit to be the desired value CCT.