The absorbed energy is converted to heat energy. The scenario you mention with the LED is very close to the blackbody problem known as the ultraviolet catastrophe.. There is a Wikipedia article about it here. What happens in the situation you described is that the light proof box gets hotter.
Diagnosing rust on geraniums can be a challenge for growers. Rust begins with yellow spots on the underside of the leaves and can rapidly progress with brown fungal spores called pustules in the center of each spot. The pustules are raised up off the leaf surface and feel rough to the touch.
See Table 1 for examples of products. Camellia Flower Blight: This serious disease of camellia causes the flowers to turn brown. Flower blight appears in early spring when moisture is present and is caused by the fungus Ciborinia camelliae.Symptoms begin as small, brown, irregular-shaped spots on the flower petals.eaf Gall: This disease is more common on sasanqua varieties of camellia (Camellia sasanqua) than on Camellia japonica. It is caused by the fungus Exobasidium camelliae. Leaf galls are most often observed during the spring flush of growth.