On the camera a red lamp shone.

FORBES: Vladimir Putin and the Paradox of Power

The PT-AE8000U comes equipped with a new 220W Red Rich Lamp for increased red intensity and a 2, 400 lumens brightness rating, which enables the projector to produce bright images and deliver stunning color reproduction.

ENGADGET: Panasonic PT-AE8000U projector touts brighter, smoother 3D for king-of-the-hill home theaters

Then the guide spotted a pair of bright red lights in the weeds near the riverbank: crocodile eyes reflected in the lamp light.

BBC: Tagging crocodiles in Belize