The ornamental design for apparatus for providing broadband light, as shown and described.
1. Apparatus for providing broadband light
1.1 is a top front left perspective view of an apparatus for providing broadband light.
1.2 is a top rear left perspective view thereof.
1.3 is a front side elevational view thereof.
1.4 is a rear side elevational view thereof.
1.5 is a left side elevational view thereof.
1.6 is a right side elevational view thereof.
1.7 is a top plan view thereof.
The broken line illustration in representation 1.2 shows an environmental structure and is not part of the claimed design, and the dot-dashed line illustrations in representations 1.1-1.4 define bounds of the claimed design and form no part thereof.