N.Y. Comp. Codes R. & Regs. tit. 12, § 50.15 – Designation of lasers.

(a) Every laser not otherwise exempt by this Part (rule) shall have a label so attached as to be clearly visible and such label shall contain the following information:
1. (1) The laser radiation symbol in red.
2. (2) The words “CAUTION” or “DANGER” and “LASER” in black letters.
3. (3) The wave length or lengths of the emitted laser radiation.
4. (4) The maximum output power or energy density or densities of the emitted laser radiation.
5. (5) The divergence of the emitted laser radiation in its lowest order transverse mode.
(b) Such required information shall be legibly stamped, etched or otherwise permanently marked on a yellow or white label with letters and numbers not less than three millimeters (one- eighth inch) in height where practicable.
Exceptions:
(1) If such labeling of individual lasers is impractical because of laser size or location, such lasers shall be appropriately labeled in an alternative manner.
(2) The label on any laser used exclusively in research and development need not specify numerically the wave length, maximum output power or energy density or the divergence where such parameters may be unknown or difficult to obtain. However, such labels shall contain the laser radiation-symbol and the other wording required by paragraphs (a)(1) and (2) of this section.