Is this product any good? My timer is messed up and i'm looking for a new one. Exo Terra : Products : Light Cycle Unit The part that catches my eye: At the end of each daytime cycle it will take again about 30 minutes to go from 100% light output to 0%, simulating a natural dusk period. This is less stressful for the animals and even stimulates breeding behaviour in many species of reptiles. It gives the animals time to retreat into their burrows or hiding places.