Glosso will grow in a wide range of lighting, from quite low to very high, all the lighting does is determine the growth form. In very high light it grows compact and short, creating the wonderful carpet effect many people want, however in lower lighting it just grows taller, which in some cases might be ideal as its a nice looking plant even in the taller form, just depends what you are after that's all.
That said, it probably isn't a 'low light' plant so you might just not have enough light, even for tall growth.
Sam