With an appealing minimalist persona, this Rotatable Flatspot Spot Light gives you a uniquely stylish avenue for directional lighting. it features an integrated LED bulb, and offers a field replaceable lens for beam control. The beam spread has a range of 15 to 24 degrees. What does it mean to set of 2?It simply means that there are two lights, each with the separate quantity indicated, in the order & packaged together. If you have any questions about our products, please contact us and we will reply to you within 24 hours. Product Size 3 heads Size: L 100cm x H 20.3cm / L 39.4″ x H 10″(Track 100cm) 5 heads Size: L 100cm x H 20.3cm / L 39.4″ x H 10″(Track 100cm) 8 heads Size: L 150cm x H 20.3cm / L 59″ x H 10″(Track 150cm) Details Material: Aluminum Light source: Integrated LED Kelvin range: Warm Light (3000K), Neutral Light (4500K), Cool Light (6000K) Power: 5W(single light) Voltage: AC 110-240V Mounting: Ceiling Environment: Indoor Weight: 2kg / 4.4lbs IP: IP20 Battery: No Driver Required: Yes Finishes: White, Black Process: Lacquered, Polishing Control method: push-button switch (Not dimmable)