This is another “turned-type” of oil lamp on which a side nozzle for the wick is formed or added after turning the clay on the wheel.
In Luke, Jesus speaks to general practice of oil lamp usage and likens it to a believer’s walk in obedience and filling of the Holy Spirit. The idea is that Christ has enabled the Christian to live an abundant life for all to see. The Christian should cleanse themselves of greed and other sins for the Spirit to manifest itself in them so to walk in the light as He is in the light.
“No one, when he has lit a lamp, puts it in a cellar or under a basket, but on a stand, that those who come in may see the light. The lamp of the body is the eye. Therefore when your eye is good, your whole body is also full of light; but when it is evil, your body also is full of darkness. Therefore see whether the light that is in you isn’t darkness. If therefore your whole body is full of light, having no part dark, it will be wholly full of light, as when the lamp with its bright shining gives you light” (Luke 11:33-36 WEB).