I can't say so 100%, but I have seen many pieces like this attributed to Webb or Stevens & Williams.
As for the night light speculation; I highly doubt it, but believe it's nothing more than a decorative piece of Art Glass and could be used as a small flower vase too. I am assuming you believe a votive candle would go in it and it could be carried around by the handle. The handle itself would become to hot to touch with a flame of the candle under it, plus the glass from that period was not heat tempered and the handle would likely end up cracking from the heat.
It seems that so many are always attempting to assign a specific use for everything old these days, but some old things were made just to look at and enjoy for what they are or could be used in any way the owners saw fit.
It's a nice looking item, but I have no clue as to the value of it. Most of what I see like this, that actually sells doesn't often go for a whole lot, but sometimes it does, depending on who wants it and how badly they want it. I also see a lot of it setting in antique shops, with high prices on it and in need of a good dusting, having been setting there so long.
Expose it to a black light and see if the outer white area glows green. If so that may be a selling\value factor to someone who cares about such things, plus glass items like this, by the makers I mentioned above are often made with a white to cream colored glass that will produce the glowing effect when exposed to a black light. --- Mike