The Arcadia Optimal Heat Pack has a number of uses. Use the Halogen Lamp during the day for basking and then the Deep Heat Projector at night when required to provide a lightless but energy efficient and bioavailble heat source. Alternatively, pair the bulbs together as a hybrid system, the Halogen lamp is bright and attractive to basking, it is quickly warming and IR-A rich. The Deep Heat Projector when placed together with the Halogen will further fill the spectrum adding in more IR-B.
From Arcadia Reptile's 10 years+ of testing this technology it is the coupling of both Halogen and Deep Heat Projector that shows the very best results in terms of increases in activity, feeding, colouration and reproduction.