For new LED lamps, shades are generally metal
Second, in the color as long as a little attention on it, the white light of the light penetration of the light is better, and crystal base can be used to create a crystal clear effect; black and color relative to the light penetration of the poor Some, can light down the radiation, so that the local strong light, and the bronze base with.
Shade in the use of a period of time, not only dust cover, as well as long-term exposure to light, resulting in color off, we can use these small methods, in the details of the shade to do the cleaning to extend the life of the lamp cover.
Self-tapping screws for non-metallic or softer metal, do not have the bottom hole and tapping; self-tapping screws are pointed, so as to "self-attack"; ordinary screws are flat head, the same thickness.
Self-tapping screw is said: drilling holes for the hole without tapping, with the screws and the general difference, the head for the sharp, teeth from the relatively large, and no trace of wire like a bit, you can not directly into the tapping , Metal and plastic usually use this method.
It can be in the consolidation of the material, by its own thread, will be solidified "attack - drill, squeeze, pressure" out of the corresponding thread, so close with each other.
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