
13 years
I know this is not going to overly helpful, but visit your local lighting shop, or DIY/IKEA shop, and see what they have to offer. That will give you a much indication of what is suitable for your hostel.
I would advise against batteries as backpackers will most likely 'borrow' the batteries, and 'forget' to return them. You will also have the problem of them draining quickly, and buying new ones.
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