Method of calibrating light delivery systems, light delivery systems and radiometer for use therewith

A method of setting respective output light irradiance levels of a plurality of light delivery devices (10) to the same irradiance level using the same radiometer (38), each light delivery device (10) comprising light-emitting means (12), output means (24;24,26) for supplying the emitted light to a site to be irradiated, intensity control means (16) for adjusting the irradiance of the delivered light, a memory unit for storing irradiance levels, and control means (28) for controlling the intensity control means (18), the radiometer (38) having data storage means (50) for storing data including light irradiance values, the method comprising the steps of:

• temporarily coupling the radiometer (38) to the output means of each light delivery device in tuns, and outputting to each said light delivery device a desired irradiance level previously stored in the memory of the radiometer (38);
• and
• storing the light irradiance value in the memory unit of each said light delivery device (30) for future use in normal operation.

A radiometer (38) for use in setting output light delivered by at least one light delivery device (10) to a desired light irradiance level, said at least one light delivery device comprising light emitting means (12), light output means (24;24,26) for supplying the emitted light to a site to be irradiated, intensity control means (16) for adjusting the irradiance of the delivered light, a memory unit for storing irradiance levels, and data communications means (28, 34, 36), the radiometer (38) comprising:

• means for measuring an irradiance level of light delivered by said light output means of said light delivery device;
• data communications means (48, 54, 56) complementary to the data communications means (28, 34, 36) of the light delivery device, and
• control means (48) for establishing data communications with a light delivery device (10) coupled thereto and for outputting to said light delivery device (10) said desired light irradiance value from said memory via the data communications means.

A light delivery device comprising light-emitting means, light output means for delivering the emitted light to a site to be irradiated, intensity control means (16) for adjusting irradiance of delivered light;

• and control means for controlling the intensity control means and for communicating with an external radiometer, the control means being operable to adjust the intensity, successively, to a plurality of intensity levels and, for each intensity level, communicate with the radiometer to obtain from the radiometer a corresponding series of actual irradiance levels measured by the radiometer and store each irradiance value in a memory unit in association with the corresponding intensity level.