"cones of light" is grammatically correct and usable in written English.
It is a phrase that is often used to describe the shape and direction that a light source casts, such as a spotlight. For example, "The musician was lit from below by a cone of light that shone up onto the stage."
Two helicopters hovered overhead, throwing down cones of light.
Here's one of Anthony McCall's cones of light, crossing the room in a bath of artificial haze.
They have vistas: floorboards that stretch deep into interiors bathed in cones of light cast by ceiling lamps, or expanses of cobblestones that have the softness of marshmallows.
I remember we did a tour, and they had these cranes out in the audience, flying around, casting cones of light down on the audience, so that everyone in the audience had these halos on their heads.
Inside an abandoned cinema from the 1930s, the architect Sou Fujimoto collaborated with COS to create the "Forest of Light" — an immersive installation that forms a glowing thicket of towering cones of light.
Blue jets propagate out of the tops of thunderclouds at surprisingly low velocities (roughly 100 km, or 60 miles, per second) in the form of narrow cones of light that are blue in colour.
Last year the brand teamed up with a Japanese architect to create a "forest of light". Participants walked around a dark room while cones of lights, like spotlights, jumped around them.
Hermione is caught against a concrete wall in a slanting cone of light.
A classical score swells as one train passes under a cone of light, revealing the colorful graffiti along its flank.
We skied largely in silence, our worlds reduced to the cone of light cast from our headlamps.
Since the early 70s, this British pioneer of light art has experimented with the ways a cone of light can seem "solid" when dust and vapour pass through.
