A light-emitting device of the present invention includes: a light-emitting element; and a phosphor layer containing phosphors that absorb light from the light-emitting element and wavelength-convert the absorbed light to emit light. The transmitter receives a stream of data bits and breaks a number of data bits off of the stream to form a bit sequence. The system transmits a value measured by the sensor to a surface location. The elongate catheter body may be composed of an inner shaft having an inner shaft lumen, a stiffening mandrel disposed within the inner shaft lumen, and an outer shaft having an outer shaft lumen, wherein the inner shaft is disposed within the outer shaft lumen. The first and second linkages are adapted and configured to minimize lateral tire scuffing during shock absorber stroking.