The PT-RW430UK is rated at 3500 lumens. While we were unable to achieve that output level in our tests, we still measured 3052 lumens at full wide zoom using a 100 IRE (white) field in Dynamic mode. I mention the white field, because the PT-RW430UK adjusts its RGB balance depending on presence of color in the displayed image. So, just bringing up the menu (which has color in it) on-screen causes the light output to drop by 47%. This means the high lumen output is only available for black-and-white presentations. As noted in the Color and Picture Quality section of this review, this RGB adjustment does result in better color accuracy, but could be a problem if higher lumen output is needed. At full telescopic zoom, output dropped to 1709 lumens.
For the rest of our testing, the lens was at mid-zoom, which dropped the output to 2701 lumens. Other modes (which do not have the automatic RGB balance adjustment as they are better balanced to begin with) are substantially lower. Selecting Graphics or Standard modes reduces the output to 1406 and 1185 lumens respectively. The other modes were all quite close in output, but presented another significant drop. Cinema mode clocked in at 703 lumens, while Natural and Rec. 709 (the best color balanced mode) and DICOM Sim modes were equal at 643 lumens.
The picture on the right is in the projector's brightest mode, Dynamic.