Electrical components, how can I regulate temperature?
I’m making a case that’ll house plants for an Extended Biology Project. I’ve made it so that each of the 12 plants have their own violet LED that’s on a timer to supply 8 hours of direct light. I suppose it’ll be difficult to regulate CO2, but I think I should be able to regulate temperature at about 25 degreesC within the case? Where could I get a heating component that I could wire up alongside a thermostat and how would I wire it up? The bulbs are powered by mains that then comes down to 4v through a transformer. I’d still like to power the heating circuit by mains… any ideas? Other constructive comments are welcome 
Thanks
Assuming you are in the UK, 230 volt incandescent light bulbs are best, as you can get them in all different wattages, from 5 watts to 300 watts, and you can change sizes easily. Depending on how fancy you want to be, you can put the bulbs under the trays, and with an enclosure to keep the heat flowing to the tray and not lose to much to the sides.
Depending on the thermostat, it can control the bulbs directly or via a relay.
US, just use 120 volt bulbs.
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