We have a AAA class Newport solar simulator. We changed the Xenon Arc Lamp recently (XBO450W, Make:OSRAM) as the lifetime got over. However, the intensity is coming to be only 0.2 sun instead of 1 sun. We again changed the lamp expecting the first to be defective, still the intensity was 0.2 sun only. Even the intensity of the light seen with naked eye is very less. What can be the possible problem? How to solve the issue?