modified spectrum

Defined in 1 dictionary — U.S. Code

United States Code

42 U.S.C. § 6291 — for purposes of this part (6 versions over time)

The term “modified spectrum” means, with respect to an incandescent lamp, an incandescent lamp that—

(i) is not a colored incandescent lamp; and

(ii) when operated at the rated voltage and wattage of the incandescent lamp—

(I) has a color point with (x,y) chromaticity coordinates on the Commission Internationale de l’Eclairage (C.I.E.) 1931 chromaticity diagram that lies below the black-body locus; and

(II) has a color point with (x,y) chromaticity coordinates on the C.I.E. 1931 chromaticity diagram that lies at least 4 MacAdam steps (as referenced in IESNA LM16) distant from the color point of a clear lamp with the same filament and bulb shape, operated at the same rated voltage and wattage.