Unlike many other succulents, Haworthias don’t like strong direct sunlight. In the native habitats, they mostly grow in the filtered shade of rocks, shrubs, and bushes. When sunlight is too strong, shade cloths can be used to diffuse sunlight. On the other hand, they will stretch if the light intensity is too low, and in this case, grow lights can be used for compensating the insufficient natural light.
The ideal range of light intensity for Haworthias is 6,000~12,000 lx. If the light intensity further increases, plants may suffer from sunburn and can even die. In general, more light can be given to mature plants with well-established roots, and to the species with thicker leaves (for example, H. truncata and H. emelyae). Note that plants take time to adopt stronger light, the intensity should be gradually increased. If leaves of a plant turn from green to dark red or black, that is a sign of too much light and the light intensity should be reduced.