A solid-state illuminating apparatus includes a first light reflector, a second light reflector, an annular light permeable cover and a light source. The folding book holder has a bottom portion and two support portions. A method for determining the activity of compounds for inhibiting the glycation of cutaneous proteins, in particular for inhibiting the glycation of collagen is also described. In some embodiments the spring washers release the plastic mounting bracket for linear translation as a unit with the mast jacket with the path traversed by the mast jacket being defined by the vertical slots in the mounting bracket.