Repitile Heaters for heating grow box at night?

Hi Rollitup experts.

Temperatures are starting to dip here to about 13/55 at night. During the day the ladies are heated by lights but the temperature does dip when lights are off.

My grow box is 2f x 2f X 4f.

I am considering getting low wattage reptile heaters, which would kick in on a timer at night.

Has anybody had any experience with any of the following or would recommend an alternative?

http://www.ebay.co.uk/itm/Reptile-Vivarium-Propagator-Heat-Mat-Moisture-Proof-10W-/120541385104?pt=UK_Pet_Supplies_Reptiles_Spiders_Insects&hash=item1c10d39190

http://www.ebay.co.uk/itm/REPTILE-HEAT-MAT-130-x-274mm-7-Watts-FITTED-PLUG-/260491640383?pt=UK_Pet_Supplies_Reptiles_Spiders_Insects&hash=item3ca682fe3f

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=160527781494&var=460032197484&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en

Thanks for any advise.

i own an iguana and i own mulitple lighting/heating sources for him. if you want to maintain some heat at night you can try a ceramic heat emitter. i would get the lower wattage they have i think its 75w or 50w. keep it about a foot away from your plant(s) and it should raise the temp about 5-10 degrees. or you could just turn the heat on in your house haha

Thanks for the feedback

or you could just turn the heat on in your house haha

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I've got an electric room heater I can put on a timer once the lights go off. I was, however, hoping to utilise localised heating to save on electricity.

i hear ya on saving electricity. a low wattage ceramic heat emitter on for a few hours at night wont put too much of a dent on your bill. i run hundreds and hundreds of watts all day for my iggy and i only pay around 150/month. i loves him

I use a reptile heat mat for heating clones while they root and it works great. Have it on a thrmostat to maintains perfect soil temps. Not sure if it would do as good a job on ambient temps, since it's most effective when in contact with a solid though. Hell, I even use my incubator to pop seeds! (I'm a snake breeder)

How about an electric blanket? Anyone try this?

Thanks for for the valuable feedback. Much appreciated.