It was once reported that light consists of two types of matter composed of C, O, Ta, and Re. However, light matter collected on a plastic substrate did not contain Ta and Re. The subsequent verifying experiments elucidated that light matter contains only C and O. Light matter was found largely comprised of C with an occupation rate of more than 92%. As referred to the highest thermal conductivity of C and its dominant occupation rate, C-rich light matter is revealed to carry magnetic, thermal energy. The identified C and O, and the thermal energy stored in light matter closely match the C and O, and light energy required for photosynthesis. This matching confirms that chemical elements and energy required for photosynthesis are supplied from light matter itself. Meanwhile, this work reports the existence of another B-containing massive light matter. The major elements of massive matter were found to be B, C, and O. The reporting massive matter is likely to be part of light matter-emitting structure embedded in the previously proposed atomic structure. With new chemical elements of massive matter, it was revealed that light is composed of C-rich and B-containing matter, played a critical role in accounting for the electromagnetic energy possessed in light matter.