Rough service lamp
Rough service lamp means a lamp that -
(1) Has a minimum of 5 supports with filament configurations that are C-7A, C-11, C-17, and C-22 as listed in Figure 6-12 of the IESNA Lighting Handbook (incorporated by reference; see § 430.3), or similar configurations where lead wires are not counted as supports; and
(2) Is designated and marketed specifically for ‘rough service’ applications, with
(i) The designation appearing on the lamp packaging; and
(ii) Marketing materials that identify the lamp as being for rough service.
10 CFR § 430.2
For purposes of this part, words shall be defined as provided for in section 321 of the Act and as follows -