Figure 1

Spectral emission curves for the three types of LEDs used for mice rearing. The white light emitting LEDs had a broad emission spectrum (400–760 nm) with a high peak at 443 nm and a lower broad peak at 575 nm. The spectrum of the blue-emitting LEDs ranged from 410 to 510 nm with a sharp peak at 452 nm. The spectrum of the red-emitting LEDs spanned from 585 to 660 nm with a major peak at 629 nm.