Less controversial - no lower than 15°C/ 60°F, ideally minimum of 18°C - 20°C/ 70°F - for breeding

light - at least 12 hours a day (mine is 14)
full spectrum fluorescent tubes
link to Arcadia for explanation of the benefits of their Bird Lamps/ tubes
these tubes also bring out the Lavender's colour nicely
replace annually
slow delivery, good prices - UK mail order - Fish, Fur & Feather
ideally electronic ballast flicker-free fluorescent battens (~ 20,000cps)
good, inexpensive UK mail order - Alert Electical
(codes D120, D121, D122 & D123 fit the bill)