heat wave lamp

Can a Exo Terra Heat Wave Lamp (40W) heat a viv (30x30x45 cm) in which temps drop to around 8ºC? Can it heat up till 30ºC? Is a 60W better or does the 40W do the job? I want to heat it up in the Winter but I dont want it to melt things and I don't want to harm my Phelsuma either. I dont know if...

Hi there i was just wondering as I am planning on creating a new viv for my leo's whether im any better off using a heat wave lamp opposed to a heat wave mat would it be suitable for the leo's and would it be any better than the traditional mat im used to using thankyouuu :D