Dictionary » L » Lamps



1. A light-producing vessel, instrument or apparatus; especially, a vessel with a wick used for the combustion of oil or other inflammable liquid, for the purpose of producing artificial light.

2. Figuratively, anything which enlightens intellectually or morally; anything regarded metaphorically a performing the uses of a lamp. Thy word is a lamp unto my feet, and a light unto my path. (Ps. Cxix. 105) Ages elapsed ere Homer's lamp appeared. (Cowper)

3. (Science: physics) a device or mechanism for producing light by electricity. See incandescent lamp, under incandescent. Aeolipile lamp, a hollow ball of copper containing alcohol which is converted into vapor by a lamp beneath, so as to make a powerful blowpipe flame when the vapor is ignited.

arc lamp, any brachiopod shell of the genus terebratula and allied genera. The name refers to the shape, which is like that of an antique lamp. See terebratula. Safety lamp, a miners lamp in which the flame is surrounded by fine wire gauze, preventing the kindling of dangerous explosive gases; called also, from Sir Humphry Davy the inventor, Davy lamp. To smell of the lamp, to bear marks of great study and labour, as a literary composition.

Origin: f. Lampe, L. Lampas, -adis, fr. Gr, torch, fr. To give light, to shine. Cf. Lampad, lantern.

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A question about insects ?

Hi everybody I have a question about insects: Why insects go to light? for example in the night they whirl lamps :?:

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by hadisahami
Sat Dec 24, 2011 8:39 am
Forum: Zoology Discussion
Topic: A question about insects ?
Replies: 3
Views: 2765

Photosynthesis Experiment - Do LED's work?

LED lamps work, and they are pretty eco if you ask me (they use less power). But as guys before me said, you need the right colors. Here is my handmade LED lamp: http://img585.imageshack.us/img585/7144/63132836.th.jpg ...

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by Vaucheria
Thu Jul 07, 2011 3:49 am
Forum: Botany Discussion
Topic: Photosynthesis Experiment - Do LED's work?
Replies: 8
Views: 9139

UltraBright UV transilluminator

... with a more intense and focusing light. It means the convergence of light cone angle is smaller for LEDs. LED's light flux is much higher than UV lamps. It is also hard to measure the luminance with a fair condition. The UV luminance meter is with a sensor compatible for UV and blue light needs ...

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by swing0916
Thu Nov 11, 2010 10:49 am
Forum: Molecular Biology
Topic: UltraBright UV transilluminator
Replies: 17
Views: 17699

Re: UltraBright UV transilluminator

I used a photospectrometer to check the spectrum at UV lamp and black glass positions, and found there is visible light emitted from the lamps. When the lights go through the black glass filter, there is nearly only UV rays transmitted. I guess it's why the image of DNA bands is with a better ...

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by swing0916
Sat Oct 16, 2010 1:31 pm
Forum: Molecular Biology
Topic: UltraBright UV transilluminator
Replies: 17
Views: 17699

Re: UV Microscopy

... and filters between the objective and the eyepiece. But I did want to mention a problem with some older microscopes that use the big mercury-vapor lamps as a UV source. The housing for these lamps have openings to allow for cooling and a lot of UV escapes thru the openings in the housing. Many ...

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by Fauna
Mon Jul 28, 2008 9:24 pm
Forum: General Discussion
Topic: UV Microscopy
Replies: 7
Views: 5158
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