Do not, however, look toward any intense source of light.

Laser therapy: Lasers are simply very intense light sources.

On a cloudless night, the sky is black because there is no sufficiently intense source of light to be reflected off the air.

Radio astronomers, you note, find Venus to be an intense source of radio waves.

On the other hand, intense sources are more difficult to make and higher acceleration voltages are needed for a given range.

Another intense source of an electromagnetic pulse is a nuclear explosion.

Before then, scientists knew only that the Sun was an intense source in these wavebands.

Synchrotron radiation is quite simply the most intense source of white X-rays we have.

Yours says that there ought to be an intense source of hi-radiation inside that thing; the other one doesn't.

Avoid exposure to intense light sources for at least 40 hours.