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You can make the gh warm in winter with solar heating, but you can't make it light with er, um ... solar light
All gardeners know better than other gardeners." -- Chinese Proverb. -
Very appropriate to point out that limitation, 2S, and entirely right...Originally posted by Two_Sheds View PostYou can make the gh warm in winter with solar heating, but you can't make it light with er, um ... solar light
Of course if you have access to mains electricity you can have "grow lights" but although there are some grow lights that claim to work off a battery (which you could try recharging during the day) they're not likely to work any too well or for very long coz the power required for the range and intensity of lightwaves to match the sun is not going to come out of a torch or car battery....
As an amusing aside I can add here the sad story of a schoolboy (not me!) trying to grow dope in his wardrobe without his Mum finding out: consisted of a seed in a pot with his desk lamp on an extension left on overnight..... Didn't work!
But already by now (first week of Feb) we are approaching 10 hours daylight of various quality but still possible hefty frosts. And this winter a lot of direct sun (to the point where onion seedlings I'm growing on a windowsill are doing better this year than those under grow-lights, which wouldn't normally be the case). The auxiliary lighting needed in a greenhouse (providing by whatever means you can keep it from freezing) is only a short extension to the available daylight hours so perhaps not as difficult or pointless as first thought as greenhouses are usually sited to maximise light anyway (e.g. will get more than most windowsills). The point I'm rather labouring here is IF you can ensure (for free, by "solar heating or whatever) that the greenhouse doesn't fall to freezing at night you can at the very least start using it significantly earlier than you otherwise could......Comment
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