Aye, here's a quick render of two spherical volume lights... Actually, three renders, overlapped! The Purple on the left and the orange glow on the right represent the lights independent of each other, and when put in the same scene the middle effect is produced. The lights are simple : volume on, infinite on, and ranged. Change the color of the lights to match with the Material lab colors, for Diffuse, Ambience, Volume, etc.... Or mix them up for cool effects!