Haworthias don’t like strong direct sunlight. In the native habitats, they mostly grow in the filtered shade of rocks, shrubs, and bushes. Shade cloths can be used to diffuse sunlight and reduce the intensity. On the other hand, a plant will stretch if the light intensity is too low. In this case, grow lights can be used for compensating the insufficient natural light.
Below is a brief summary of the ideal light intensity for some common species. A Haworthia which has been taken too much light will turn to dark red color. It will gradually recover after being moved to a more shaded place.
* For a plant that has well-established roots, the intensity can go up to 10,000 lx.