I'll cut out the visible spectrum before the flash, and convert and reconvert the infra-red.
The energy of those wave-lengths near the ends of the visible spectrum will be inefficient in producing light.
Its visible spectrum consists chiefly of violet, blue, green, and yellow rays.
The artifices of the modern physicist have extended far in each direction the visible spectrum known to Newton.
The red rays vibrate the most slowly and have the longest wave-length of all the rays of the visible spectrum.
Of all the colours of the visible spectrum the red possesses the highest heating power.
This is actually the case when the waves of the visible spectrum pass through a transparent gas or vapour.
Here he found the temperature actually higher than in any part of the visible spectrum.
The seven colours seen in the spectrum are called the Visible Spectrum.
A facet of his panel had flashed a color at the lowest end of his visible spectrum.