This standard sets forth the physical and electrical characteristics required to assure interchangeability and to assist in proper application of single-based fluorescent lamps. Single-based compact fluorescent lamps, both self-supporting and those requiring auxiliary support, including circular-, square-, and Ushaped lamps, are specified. Specifications for the lamp itself and the interactive features of the lamp with the ballast are given. Information for luminaire design is given for certain lamp types. The lamps covered in this standard are intended for use with external ballasts as described. These lamps are designed for 60 Hz and/or high frequency (HF) operation. Many of the lamp types covered in this standard are closely comparable to those specified in IEC 60901.