In its natural habitat, "N. rajah" grows in open areas, where it is exposed to direct sunlight – it therefore needs to be provided with a significant amount of light in cultivation as well. To meet this need, many growers have used metal halide lamps in the 500–1000 watt range, with considerable success. The plant should be situated a fair distance from the light source, 1 to 2 m is recommended. Depending on location, growers can utilise natural sunlight as a source of illumination. However, this is only recommended for those living in equatorial regions, where light intensity is sufficient to satisfy the needs of the plant. A photoperiod of 12 hours is comparable to that experienced in nature, since Borneo lies on the equator.