lumen
Cavity or candela
Lumen has two distinct technical meanings.
In anatomy, a lumen is the hollow space inside a tube-shaped structure: the lumen of a blood vessel, the lumen of the intestine.
In physics, a lumen is a unit measuring the total amount of visible light emitted by a source: a 60-watt bulb produces about 800 lumens.
Brighter lights have higher lumen counts.
Luminous intensity unit
- luxSI illuminance unit
- foot-candleLuminance measurement unit
- fluxContinuous change or flow
- luminosityIntrinsic brightness of source
illuminance · brightness · intensity · watt · photometry · photon · radiant · emission
Steady, soft light
- radianceGlowing luminous quality
- brightnessDegree of light emitted
- luminosityIntrinsic brightness of source
- shineEmit or reflect light
gleam · shimmer · beam · brilliance · incandescence · fluorescence · phosphorescence · effulgence
candela
Luminous intensity unit
- luxSI illuminance unit
- foot-candleLuminance measurement unit
- fluxContinuous change or flow
luminosity · illuminance · brightness · intensity · watt · photometry · photon · radiant · emission · output
glow
Steady, soft light
- radianceGlowing luminous quality
- brightnessDegree of light emitted
- luminosityIntrinsic brightness of source
shine · gleam · shimmer · beam · brilliance · incandescence · fluorescence · phosphorescence · effulgence
aperture
Adjustable optical inlet
- orificeBodily passage entrance
- boreTiresome individual or drill
- diameterDistance across through center
cross-section · caliber · gauge · width · patency · stenosis · occlusion · narrowing · dilation · constriction
cavity
Empty space within
bore · intestine · esophagus · trachea · artery · vein · vessel · bronchus · urethra · vas
- stomach partsstomach, fundus, cardia, pylorus, body
- lightsunlight, daylight, shine, rays, moonlight
- light effectsshine, glow, gleam, shimmer, glitter
- standardsstandard, standards, norm, norms, criterion
- unitsunit, angstrom, yard, meter, base units
- Intestinesintestine, intestines, small intestine, large intestine, bowel
- luminous greenBright, light-emitting verdant shade
- luminous intensityLight output per direction
- luminous paintLight-emitting surface finish
- luminescent paintLight-emitting surface coating
illuminate, luminous, illumination, illuminated, luminary, illuminating, luminescent, luminescence, illuminations