A lamp assembly selectively engageable with a frame member of a cattle chute without using tools. The frame member is received into a channel of a mounting assembly of the lamp assembly. A locking mechanism is pivoted to lock the mounting assembly around the frame member. The orientation of the lamp is adjusted by pivoting a support assembly connected to the lamp into a desired position relative to the mounting assembly and engaging locking pins to retain the support assembly in the selected orientation. The lamp includes a plurality of LEDs that are actuated to shine light into the cattle chute. The lamp assembly is removed from the chute frame member by pivoting the locking mechanism back to an unlocked position and then moving the mounting assembly in a direction that causes the frame member to exit the channel.
