Blue capped Waxbills - Housing

Nothing particularly special for these waxbills - exception is perhaps need for space

Wild-caught Cordon Bleus are much more willing to nest when kept in aviaries or flights rather than cages

My pairs are in a variety of cages and flights - all cages are more flight cages eg below

Light and Temperature

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 show all 'Blue' Waxbills to perfection
replace annually
slow delivery, good prices - UK mail order - Fish, Fur & Feather

ideally electronic ballast flicker-free battens (~ 20,000cps)
good, inexpensive mail order UK supplier - Alert Electical
(codes D120, D121, D122 & D123 fit the bill)

temperature - no lower than 15°C (60°F) - especially when breeding