Diameter - 40mm to 100mmbeam angle - 60 degree to 160 degreeheight - 18mm to 35mmwatt - 10watt to 300wattmaterial - optical glass ( borosilicate glass )heat resistance - -50 to 500 degreetransmittance - above 94%reflective index - 1.474quality - clear and transparent, bo bubble and impurity inside.