Fluorescent lights run around 43ºF they actually go a long way to heating ambient temps. This is what I use on a simple timer system. Over night I use LED (deep blue) aquarium lighting. The kind that is NOT dimmable. The electronics that are in to drop the power from the mains to 12v run quite a lot of heat they easily hit 33-5ºC. They also will make a big dent in ambient heating. This is a relatively cheap option and if it is not 100% effective you can always add a RHP and something solid later. (RHP do not heat air but can be used to heat heavy objects that will.)
http://www.ebay.co.uk/itm/Aquarium-F...item3f1e22f05e
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