The difference is substancial, Calculite redefines small aperture while delivering MR16 comparable light levels Install-from-below style for new construction or remodel;Microstructure lenses for maximim optical performance;Fixture operates well below recommended thermal limit, eliminating lens degration and ensuring maximim optical stability;Dual-hinge construction limits required plenum depth to 5.5" It’s time to focus on the quality of the lit environment, not just the energy consumed. Lightolier introduces the Calculite 1.75". Its scale and performance open up your design possibilities. You might even forget you’re saving energy. Round and square reflectors available;Compatible with Micro Vetro accessories;Field replaceable LED board and LED driver;12°, 17°, 25°, 38° beam spreads available Office;Banks;Hospitality;Airports;Fashion;Education;Residential