| 释义 |
nounPlural lumina ˈluːmɛnˈlumən Physics The SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela. 〔物理〕流明（光通量单位） Example sentencesExamples - For consumers who want higher lumens, manufacturers offer tactical lights utilizing Xenon or Halogen gas-filled bulbs with tungsten filaments.
- Operating on 6 volts, this light provides 60 lumens of brightness to identify and target, and can subdue suspects without having to fire a shot.
- The bulbs are very bright (measured in ‘lumens’ as in the more lumens the brighter the projector), allowing the images that they project to be seen even in well-lit rooms.
- There was at least 250 watts of lumens coming down from the ceiling which was considerably high - over ten feet.
- He or she attaches the illuminator to the light source, sets it at 1,000 lumens, and places the light source on standby to reduce the chance of burns.
- ‘That said, you can still go down and buy a fluorescent lamp for a few dollars that puts out thousands of lumens,’ he says, compared to the 30 to 60 lm emitted by current white LEDs.
- On the positive side, standard metal halide offers high lumens per watt,, and fairly long life, both of which are important to building operators.
- It produces 25 lumens of white light without the distracting ‘black holes’ emitted by many flashlights.
- What we can buy is a compact fluorescent bulb that only uses 20 watts of electricity and produces 1,000 lumens, the same as a 100-watt light bulb.
- In other words, for a light meter to read 1 foot-candle from a uniform point source of light that is 1 ft. away, a light source of about 12.57 lumens is required.
- Some users might want ‘tactically blinding’ light - on the order of 90 lumens - but that could only come with double the battery load, more weight and bulk.
- A dinner candle, for example, generates about 12 lumens, while a 60-watt soft white incandescent bulb glows at around 840 lumens.
- Even on cloudy days, a tubular skylight can provide at least as much light as a 100-watt incandescent bulb - about 1,200 lumens.
- In almost every case the electronic ballast ensures the highest mean lumens per watt, both by inherent efficiency and, in the case of metal halide lamps, by better lamp power management.
- Today's lamps provide more lumens per watt than older ones, and the fixtures have been redesigned to more effectively use this light.
- Electric rather than magnetic ballast is to be preferred because it gives a more constant output, runs cooler and generates about 10% more lumens per watt.
- This 18-volt light offers 500 lumens of searing white light for 20 minutes, or you can employ the 250-lumen lamp assembly to extend run time to one hour.
- We ran the projector both in Eco mode, which is quieter, but only offers 800 lumens of output, and standard mode, which runs the fan at higher RPMs and pumps the light output to 1000 lumens.
- It comes with two lamps, one with 125 lumens output (one hour battery life) while the other offers 225 lumens (20 minutes of life).
- It's that time of year when some of your neighbors have probably lit up the night with enough lumens to be seen from outer space.
OriginLate 19th century: from Latin, literally 'light'. nounPlural luminaˈluːmənˈlumən Anatomy The central cavity of a tubular or other hollow structure in an organism or cell. 〔剖〕腔 the stomach empties food into the lumen of the small intestine Example sentencesExamples - These cells were found minimally invading the liver, by direct extension, but were readily found within the lumina of blood vessels and lymphatics.
- Fibrin and platelet thrombi were prominent in the lumina of the vessels and in the space beneath the endothelium.
- Clear cell carcinoma may contain more ‘condensed’ nonclear cells with pink cytoplasm, mimicking ducts, albeit lacking lumina.
- These loose columnals may have had soft matrix removed from the central lumina and, thus, would have been very bead-like in appearance.
- Histologically, the disease is characterized by a bizarre population of neoplastic cells that are found systemically within the vascular lumina.
Synonyms space, chamber, hollow, hole, pocket, pouch
Derivativesadjective ˈluːmɪn(ə)l Anatomy Unlike an infection, endometriosis does not damage the luminal epithelium of the Fallopian tube and thus surgery is more likely to be successful. Example sentencesExamples - Autopsy findings confirmed luminal narrowing of bronchioles by scarring, which is a histopathologic features of bronchiolitis obliterans.
- Unfortunately, the absence of endothelial cells at the luminal surface of prosthetic vascular grafts potentiates thrombosis and neointimal hyperplasia.
- In fact, the capillary luminal diameter has been increased in the skin and nerves of patients with diabetes, even in the presence of neuropathy.
- The upper airway size is determined by the balance between static pharyngeal mechanics, neuromuscular activity, and luminal pressure.
OriginLate 19th century: from Latin, literally 'opening'. nounˈlo͞omənˈlumən Physics The SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela. 〔物理〕流明（光通量单位） Example sentencesExamples - Operating on 6 volts, this light provides 60 lumens of brightness to identify and target, and can subdue suspects without having to fire a shot.
- On the positive side, standard metal halide offers high lumens per watt,, and fairly long life, both of which are important to building operators.
- There was at least 250 watts of lumens coming down from the ceiling which was considerably high - over ten feet.
- Today's lamps provide more lumens per watt than older ones, and the fixtures have been redesigned to more effectively use this light.
- We ran the projector both in Eco mode, which is quieter, but only offers 800 lumens of output, and standard mode, which runs the fan at higher RPMs and pumps the light output to 1000 lumens.
- For consumers who want higher lumens, manufacturers offer tactical lights utilizing Xenon or Halogen gas-filled bulbs with tungsten filaments.
- The bulbs are very bright (measured in ‘lumens’ as in the more lumens the brighter the projector), allowing the images that they project to be seen even in well-lit rooms.
- Some users might want ‘tactically blinding’ light - on the order of 90 lumens - but that could only come with double the battery load, more weight and bulk.
- It's that time of year when some of your neighbors have probably lit up the night with enough lumens to be seen from outer space.
- He or she attaches the illuminator to the light source, sets it at 1,000 lumens, and places the light source on standby to reduce the chance of burns.
- It comes with two lamps, one with 125 lumens output (one hour battery life) while the other offers 225 lumens (20 minutes of life).
- Even on cloudy days, a tubular skylight can provide at least as much light as a 100-watt incandescent bulb - about 1,200 lumens.
- This 18-volt light offers 500 lumens of searing white light for 20 minutes, or you can employ the 250-lumen lamp assembly to extend run time to one hour.
- A dinner candle, for example, generates about 12 lumens, while a 60-watt soft white incandescent bulb glows at around 840 lumens.
- It produces 25 lumens of white light without the distracting ‘black holes’ emitted by many flashlights.
- What we can buy is a compact fluorescent bulb that only uses 20 watts of electricity and produces 1,000 lumens, the same as a 100-watt light bulb.
- ‘That said, you can still go down and buy a fluorescent lamp for a few dollars that puts out thousands of lumens,’ he says, compared to the 30 to 60 lm emitted by current white LEDs.
- In other words, for a light meter to read 1 foot-candle from a uniform point source of light that is 1 ft. away, a light source of about 12.57 lumens is required.
- In almost every case the electronic ballast ensures the highest mean lumens per watt, both by inherent efficiency and, in the case of metal halide lamps, by better lamp power management.
- Electric rather than magnetic ballast is to be preferred because it gives a more constant output, runs cooler and generates about 10% more lumens per watt.
OriginLate 19th century: from Latin, literally ‘light’. nounˈlo͞omənˈlumən Anatomy The central cavity of a tubular or other hollow structure in an organism or cell. 〔剖〕腔 the stomach empties food into the lumen of the small intestine Example sentencesExamples - Fibrin and platelet thrombi were prominent in the lumina of the vessels and in the space beneath the endothelium.
- Clear cell carcinoma may contain more ‘condensed’ nonclear cells with pink cytoplasm, mimicking ducts, albeit lacking lumina.
- These cells were found minimally invading the liver, by direct extension, but were readily found within the lumina of blood vessels and lymphatics.
- Histologically, the disease is characterized by a bizarre population of neoplastic cells that are found systemically within the vascular lumina.
- These loose columnals may have had soft matrix removed from the central lumina and, thus, would have been very bead-like in appearance.
Synonyms space, chamber, hollow, hole, pocket, pouch
OriginLate 19th century: from Latin, literally ‘opening’. |