... of heat during the test, thus the temperature inside the integrating sphere can not meet ... in a constant air temperature.Specifications:• Diameter: IS-0.3M (φ0.3m),IS-0.5M (φ0.5m),IS-1.0M ... refer to the environmental temperature with 25°C).A. Temperature Increasing tolerance: ±1°CB. Temperature Down tolerance: ±2° ... The flux testing range is 0.1 to 1,999,900 lm. Constant Temperature Integrating Sphere