LEED certified buildings save money and resources and have a positive impact on the health of occupants, while promoting renewable, clean energy. LEED, or Leadership in Energy & Environmental Design, is a green building certification program that recognizes best-in-class building strategies and practices.he key to success is making sure you're using the right tools. LEED v4 is backed by a supporting cast of tools and resources. 1  Discover which LEED v4 rating system applies to your project. 2  Get started.
The Process of Sight. All vision is based on the perception of electromagnetic rays. These rays pass through the cornea in the form of light; the cornea focuses the rays as they enter the eye through the pupil, the black aperture at the front of the eye.
The electromagnetic waves your eyes detect â visible light â oscillates between 400 and 790 terahertz (THz). Thatâs several hundred trillion times a second. The wavelengths are roughly the size of a large virus: 390 â 750 nanometers (1 nanometer = 1 billionth of a meter).