Temperature control for fermenter and bottles

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SMOKEU

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Location
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At the moment I'm using a few 30W heat pads to heat both my fermenter and bottles while conditioning but I'm having a hard time with temperature control (it's winter here in NZ). I use a 30L fermenter and then bottle.

For the bottle conditioning, I was thinking of getting an indoor grow tent and then putting a light bulb or small heating element or something with a temperature controller so I can leave the bottles for 2 weeks to condition before moving them to storage.

My real question is:

For the fermenter temperature control, should I put it in a box with a heater or light bulb (wouldn't the light skunk the beer?) that has a controller measuring and controlling air temperature, or should I use a heat pad with a temperature sensor inside the actual wort itself in the fermenter? Keep in mind I live in NZ with 230V electricity so need something that suits.
 
If you're just interested in heating then a (free) broken old fridge will work as you just need a well insulated chamber, put a heat pad or two inside and run it off a controller. You don't need the temperature probe to be in the beer, taping it to the side of the fermenter with some insulation over the top works well.

Controller
https://www.brewshop.co.nz/brewing-equipment/fermenting-equipment/mkii-temperature-controller.html
Or build your own from an STC-1000
https://www.trademe.co.nz/Browse/SearchResults.aspx?searchString=stc-1000

Heat pad
https://www.brewshop.co.nz/brewing-equipment/fermenting-equipment/heat-pad.html
 
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