Rather than logos, have participants use a famous tag line or marketing slogan. Break the group into small teams of four to six members. Have the team choose a logo that best represents them. Alternatively, choose a logo that best represents the project or the whole work group they belong to.
Your body makes vitamin D when your skin is exposed to the ultraviolet B (UVB) rays in sunlight. About 5 to 30 minutes of exposure to the skin on your face, arms, back or legs (without sunscreen) two times every week is enough. But, too much exposure to sunlight is a risk for skin cancer, so you should use sunscreen after a few minutes in the sun, even on hazy or cloudy days.
Daily use of grow lights for plants depends on the type of plantings you have. Foliage plants need about 16 hours of light per day, while flowering plants require somewhat less, in the 12-14 hours range.