A multiwavelength light source comprising: a source (6501, 6511, 6521, 6532, 6550, 691, 7010, 7110, 7301, 7321, 7341, 7801, 7802) that emits light at a dominant wavelength; an input optical system (6502, 6512, 6522, 6533, 6551, 692, 7020, 7120, 7313, 7329, 7347, 7807, 7808) coupled to said source and collimating its light; an intermediate optical system (6504, 6514, 6526, 6537, 6559, 697, 7080, 7160, 7314, 7330, 7346, 7810), said intermediate optical system configured as a concentrator having a first end and having an exit port on the opposite end; one or more output ports; one or more mirrors (6503, 6513, 6524, 6534, 6536, 6555, 694, 695, 7030, 7140, 7305, 7323, 7344, 7805) that direct a first part (6508, 6541, 6557, 7311, 7326) of the collimated light from said input optical system (6502, 6512, 6522, 6533, 6551, 692, 7020, 7120, 7313, 7329, 7347, 7807, 7808) to at least one of said one or more output ports, and direct a second part of the collimated light from said input optical system to said first end of said intermediate optical system (6504, 6514, 6526, 6537, 6559, 697, 7080, 7160, 7314, 7330, 7346, 7810); a phosphor patch (6515, 6527, 6538, 6560, 7090, 7170, 7309, 7322, 7342, 7804) formed on said exit port, the material of said phosphor patch having a composition that luminesces in response to excitation from light generated by said source, light (6507, 6540, 6558, 7312, 7327) emitted by said phosphor patch being returned back through and out of said intermediate optical system (6504, 6514, 6526, 6537, 6559, 697, 7080, 7160, 7314, 7330, 7346, 7810), to at least one of said one or more output ports; characterized in that: the one or more mirrors (6503, 6513, 6524, 6534, 6536, 6555, 694, 695, 7030, 7140, 7305, 7323, 7344, 7805) are arranged to split the collimated light from said input optical system (6502, 6512, 6522, 6533, 6551, 692, 7020, 7120, 7313, 7329, 7347, 7807, 7808) into said first and second parts and to direct the first part to the at least one of said one or more output ports while at the same time directing the second part to said first end of said intermediate optical system (6504, 6514, 6526, 6537, 6559, 697, 7080, 7160, 7314, 7330, 7346, 7810). a source (6501, 6511, 6521, 6532, 6550, 691, 7010, 7110, 7301, 7321, 7341, 7801, 7802) that emits light at a dominant wavelength; an input optical system (6502, 6512, 6522, 6533, 6551, 692, 7020, 7120, 7313, 7329, 7347, 7807, 7808) coupled to said source and collimating its light; an intermediate optical system (6504, 6514, 6526, 6537, 6559, 697, 7080, 7160, 7314, 7330, 7346, 7810), said intermediate optical system configured as a concentrator having a first end and having an exit port on the opposite end; one or more output ports; one or more mirrors (6503, 6513, 6524, 6534, 6536, 6555, 694, 695, 7030, 7140, 7305, 7323, 7344, 7805) that direct a first part (6508, 6541, 6557, 7311, 7326) of the collimated light from said input optical system (6502, 6512, 6522, 6533, 6551, 692, 7020, 7120, 7313, 7329, 7347, 7807, 7808) to at least one of said one or more output ports, and direct a second part of the collimated light from said input optical system to said first end of said intermediate optical system (6504, 6514, 6526, 6537, 6559, 697, 7080, 7160, 7314, 7330, 7346, 7810); a phosphor patch (6515, 6527, 6538, 6560, 7090, 7170, 7309, 7322, 7342, 7804) formed on said exit port, the material of said phosphor patch having a composition that luminesces in response to excitation from light generated by said source, light (6507, 6540, 6558, 7312, 7327) emitted by said phosphor patch being returned back through and out of said intermediate optical system (6504, 6514, 6526, 6537, 6559, 697, 7080, 7160, 7314, 7330, 7346, 7810), to at least one of said one or more output ports; characterized in that: the one or more mirrors (6503, 6513, 6524, 6534, 6536, 6555, 694, 695, 7030, 7140, 7305, 7323, 7344, 7805) are arranged to split the collimated light from said input optical system (6502, 6512, 6522, 6533, 6551, 692, 7020, 7120, 7313, 7329, 7347, 7807, 7808) into said first and second parts and to direct the first part to the at least one of said one or more output ports while at the same time directing the second part to said first end of said intermediate optical system (6504, 6514, 6526, 6537, 6559, 697, 7080, 7160, 7314, 7330, 7346, 7810). the one or more mirrors (6503, 6513, 6524, 6534, 6536, 6555, 694, 695, 7030, 7140, 7305, 7323, 7344, 7805) are arranged to split the collimated light from said input optical system (6502, 6512, 6522, 6533, 6551, 692, 7020, 7120, 7313, 7329, 7347, 7807, 7808) into said first and second parts and to direct the first part to the at least one of said one or more output ports while at the same time directing the second part to said first end of said intermediate optical system (6504, 6514, 6526, 6537, 6559, 697, 7080, 7160, 7314, 7330, 7346, 7810).