Which heat plate? EcoGlow's plate isn't hot enough for outdoor brooding in colder weather, Premier's is. Wattage varies greatly by manufacturer.
You should not need to use a lamp in combination with a plate and doing so might overheat your space as well as introduce an unnecessary fire risk.
You should not need to use a lamp in combination with a plate and doing so might overheat your space as well as introduce an unnecessary fire risk.