| abstract |
A photodynamic therapy lamp has a cover (10, 11, 12, 13) which contains a light source formed from two arrays (20) of LEDs (21). The LEDs are arranged in a honeycomb pattern and have a peak wavelength of 630-640 nm. Beneath the LEDs is a lens pack (22) containing a lens (23) for each LED. Beneath this is a diffuser (7). The lenses are arranged in a honeycomb pattern and serve to concentrate the light in a substantially parallel and narrow beam. |