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by lamplight
by lamplight 表示借助灯光，常与 read、write、work 等动词连用。
She read by lamplight.
她在灯光下读书。
灯光；灯火
先理解核心含义，再看它在真实句子里的用法。
灯光；灯火
light from a lamp
She read by lamplight.
她在灯光下读书。
灯光
The light emitted by a lamp.
The old book felt warm in the soft lamplight.
那本旧书在柔和的灯光下感觉很温暖。
She preferred to read by lamplight rather than by the bright ceiling lights.
她更喜欢在灯光下看书，而不是在明亮的天花板灯下。
The lamplight cast long shadows across the room.
灯光在房间里投下长长的影子。
by lamplight 表示借助灯光，常与 read、write、work 等动词连用。
She read by lamplight.
她在灯光下读书。
in the lamplight 指处于灯光照射的范围内，通常带定冠词 the。
The cat sat in the lamplight.
猫坐在灯光里。
lamplight 作主语时，常搭配描述灯光动态的动词，如 flicker、shine、fall。
The lamplight flickered in the wind.
灯光在风中闪烁。
Not this
Please turn on the lamplight.
Use this
Please turn on the lamp.
lamplight 指灯光本身，不是灯具；可以说 turn on the lamp，但不能说 turn on the lamplight。'灯亮了' 要说 The lamp is on，而不是 The lamplight is on。
Not this
She was sitting under the lamplight.
Use this
She was sitting in the lamplight.
汉语的'在灯光下'容易直译为 under，但英语中表示'在灯光里、被灯光照着'惯用介词 in。under 侧重在物体正下方，与灯光本身不搭配。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
借着灯光
They read by lamplight in the old cottage.
他们在旧小屋里借着灯光阅读。
在灯光下
Her face looked pale in the lamplight.
她的脸在灯光下显得苍白。
温暖的灯光
The room was filled with warm lamplight.
房间里充满温暖的灯光。
灯光闪烁
The lamplight flickered in the breeze.
灯光在微风中闪烁。
柔和的灯光
She read her book in the soft lamplight.
她在柔和的灯光下读书。
昏暗的灯光
He could barely see by the dim lamplight.
他在昏暗的灯光下几乎看不见。
Use lamplight naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
lamplight=lamp（灯）+light（光），想象夜里一盏灯亮着，照出的就是灯火。
语域：neutral 常见场景：fiction and narrative prose、everyday conversation lamplight 意为“灯光”，多用于书面描写或固定搭配，如 by lamplight；口语中更常说 light 或 lamp。整体语气中性，不属于正式或非正式语域。
这些词都以 -light 结尾，词尾都读 /laɪt/，与 lamplight 的 -light 读音相同。注意形近词 straight（直的）读 /streɪt/，plait（发辫）读 /plæt/（英式）或 /pleɪt/（美式），都不发 /laɪt/。
Dictionary facts from ECDICT, WIKTIONARY.