A light emitting device lighting system comprising: at least one light emitting device configured to emit light at an illumination output level; at least one light sensor configured to measure the illumination output level of light emitted by the at least one light emitting device; and a control unit (102, 1003), the control unit (102, 1003) configured to: determine a high end trim level of the at least one light emitting device, wherein the high end trim level comprises a percentage of a maximum illumination output level of the at least one light emitting device and corresponds to an original illumination output level that produces a visual comfort level in an area, wherein the visual comfort level is an illumination or light level that is needed or desired for task efficiency and visual comfort in the area; detect the illumination output level emitted by the at least one light emitting device falling below the original illumination output level in the area; and adjust the high end trim level of the at least one light emitting device in order to increase the illumination output level by the at least one light emitting device to produce the visual comfort level in the area; characterized in that the original illumination output level comprises a stored numerical value, and the control unit (102, 1003) is further configured to adjust the high end trim level by increasing the high end trim level for the at least one light emitting device such that the visual comfort level is maintained and issuing an alert message if the at least one light emitting device cannot maintain the illumination output level associated with the visual comfort level. at least one light emitting device configured to emit light at an illumination output level; at least one light sensor configured to measure the illumination output level of light emitted by the at least one light emitting device; and a control unit (102, 1003), the control unit (102, 1003) configured to: determine a high end trim level of the at least one light emitting device, wherein the high end trim level comprises a percentage of a maximum illumination output level of the at least one light emitting device and corresponds to an original illumination output level that produces a visual comfort level in an area, wherein the visual comfort level is an illumination or light level that is needed or desired for task efficiency and visual comfort in the area; detect the illumination output level emitted by the at least one light emitting device falling below the original illumination output level in the area; and adjust the high end trim level of the at least one light emitting device in order to increase the illumination output level by the at least one light emitting device to produce the visual comfort level in the area; characterized in that the original illumination output level comprises a stored numerical value, and the control unit (102, 1003) is further configured to adjust the high end trim level by increasing the high end trim level for the at least one light emitting device such that the visual comfort level is maintained and issuing an alert message if the at least one light emitting device cannot maintain the illumination output level associated with the visual comfort level. determine a high end trim level of the at least one light emitting device, wherein the high end trim level comprises a percentage of a maximum illumination output level of the at least one light emitting device and corresponds to an original illumination output level that produces a visual comfort level in an area, wherein the visual comfort level is an illumination or light level that is needed or desired for task efficiency and visual comfort in the area; detect the illumination output level emitted by the at least one light emitting device falling below the original illumination output level in the area; and adjust the high end trim level of the at least one light emitting device in order to increase the illumination output level by the at least one light emitting device to produce the visual comfort level in the area; characterized in that the original illumination output level comprises a stored numerical value, and the control unit (102, 1003) is further configured to adjust the high end trim level by increasing the high end trim level for the at least one light emitting device such that the visual comfort level is maintained and issuing an alert message if the at least one light emitting device cannot maintain the illumination output level associated with the visual comfort level.