A phototherapy blanket system, comprising: a phototherapy blanket which is configured to cover, support, and/or envelop at least part of a subject; and a system for determining temperatures inside the phototherapy blanket, wherein the system for determining temperatures comprises: a set of light sources configured to emit electromagnetic radiation, wherein the set of light sources is adapted to be held and/or carried by the phototherapy blanket; a first temperature sensor that is adapted to generate a first output signal conveying information related to a first temperature in the phototherapy blanket; one or more physical computer processors operatively coupled with the first temperature sensor, the one or more physical computer processors configured to: determine the first temperature based on the first output signal; obtain an amount of power dissipated in one or more light sources from the set of light sources; estimate a core temperature of the subject based on: (a) the first temperature, and (b) the obtained amount of power; and control the set of light sources based on the estimated core temperature. a phototherapy blanket which is configured to cover, support, and/or envelop at least part of a subject; and a system for determining temperatures inside the phototherapy blanket, wherein the system for determining temperatures comprises: a set of light sources configured to emit electromagnetic radiation, wherein the set of light sources is adapted to be held and/or carried by the phototherapy blanket; a first temperature sensor that is adapted to generate a first output signal conveying information related to a first temperature in the phototherapy blanket; one or more physical computer processors operatively coupled with the first temperature sensor, the one or more physical computer processors configured to: determine the first temperature based on the first output signal; obtain an amount of power dissipated in one or more light sources from the set of light sources; estimate a core temperature of the subject based on: (a) the first temperature, and (b) the obtained amount of power; and control the set of light sources based on the estimated core temperature. a set of light sources configured to emit electromagnetic radiation, wherein the set of light sources is adapted to be held and/or carried by the phototherapy blanket; a first temperature sensor that is adapted to generate a first output signal conveying information related to a first temperature in the phototherapy blanket; one or more physical computer processors operatively coupled with the first temperature sensor, the one or more physical computer processors configured to: determine the first temperature based on the first output signal; obtain an amount of power dissipated in one or more light sources from the set of light sources; estimate a core temperature of the subject based on: (a) the first temperature, and (b) the obtained amount of power; and control the set of light sources based on the estimated core temperature. determine the first temperature based on the first output signal; obtain an amount of power dissipated in one or more light sources from the set of light sources; estimate a core temperature of the subject based on: (a) the first temperature, and (b) the obtained amount of power; and (a) the first temperature, and (b) the obtained amount of power; and control the set of light sources based on the estimated core temperature.