There are a number of approaches to the use of lights. Fluorescent tubes that were fabricated to provide the appropriate spectrum of light for indoor growing of plants are less commonly seen, though still available. I am unsure whether or not the standard lengths that might be used in North America will fit the fixtures (and voltages) for you, Norton. More recently, the LED technological advances have resulted in a large number of devices being fabricated, primarily, I suspect, for assisting those who wish to furtively cultivate marijuana indoors. Below is a link to a website that provided a ranking of a variety of LED products. One of the products reviewed might be ideal for your windowsill bulb-raising. The timing of getting it (i.e. you don't want to pay for something that is out of stock and only able to be delivered a month after your family member leaves the United States) is worth considering. Some of these may not be too expensive to have directly shipped to you in Peru (as they aren't like our classic conception of fragile light bulbs)! https://goo.gl/g5rc5N/ Jonathan Knisely New Haven, CT (where we have Eranthis, Galanthus, and Crocus tommasinianus up and blooming so far) USDA 6a > ------------------------------ > > Message: 4 > Date: Sun, 5 Mar 2017 00:49:51 +0000 > From: norton cuba melly <nortonc26@hotmail.com> > To: Pacific Bulb Society <pbs@lists.ibiblio.org> > Subject: [pbs] Light bulbs > Message-ID: > <BY1PR0801MB114194AE397DC3440398792BAE2D0@BY1PR0801MB1141. > namprd08.prod.outlook.com> > > Content-Type: text/plain; charset="utf-8" > > Hello everyone, > I want to ask about light bulbs for plants, since I dont have a backyard I > only have my plants expose to sunlight in a windowsill, that can reduce > posibilities of forming an strong bulb . But i wanted to know if any of you > can advice me a brand of a light bulb that offers full spectrum for plant > growth. I have a family member traveling to the US ??, so if anyone that > lives there can tell me where to buy, what brand, how much watts... ? It > would be helpful > Thanks if you can help me > > Best regards > Norton > >