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0.5 footcandle = 5.381 lux
What else can I help you with?
How many footcandles in a fluorescent tube?
444
What are the minimum footcandles allowed for a walk-in refrigerator?
The minimum footcandle requirement for a walk-in refrigerator typically ranges from 10 to 20 footcandles, depending on local codes and regulations. This lighting level ensures adequate visibility for safe operation and maintenance. It's important to check specific local building codes or industry standards, as they may have specific requirements for different types of facilities.
Are decibels used to measure light?
Absolutely. Photographic light meters are designed to measure light for photographic exposure (in a film-speed/shutter-speed/aperture combination), but many hand-held photo light meters can measure light in footcandles, which is a common scale. If you look on places like eBay, you can find inexpensive, digital, brand new meters which read out in Lux or Lumens. Some may read in footcandles as well. It's not difficult to convert from one measure to another (there should be internet calculators which would do it easily).
What quantity of lux or foot-candles in a cave passage is considered total darkness for example .0001 or .001 or .01 or .1 etc or do you need to consider spectral response or some other factor?
Total darkness is typically defined as less than 0.005 lux, as this is the lowest level of light where the human eye can detect any presence of light. The spectral response of light may be a factor to consider for more precise measurements, but for general purposes, the lux value is sufficient.
What is the correct height to hang a light fixture above a poker table?
The bed and rails of the table must receive at least 520 lux (48 footcandles) of light at every point. A screen or reflector configuration is advised so that the center of the table does not receive noticeably more lighting than the rails and the corners of the table. If the light fixture above the table may be moved aside (referee), the minimum height of the fixture should be no lower than 40 inches [1.016 m] above the bed of the table. If the light fixture above the table is non-movable, the fixture should be no lower than 65 inches[1.65 m] above the bed of the table. The intensity of any directed light on the players at the table should not be blinding. Blinding light starts at 5000 lux (465 footcandles) direct view. The rest of the venue (bleachers, etc.) should receive at least 50 lux (5 footcandles) of light.
What are the uses of a foot candle?
The footcandle is a measure of the amount of light in a space. For classrooms the amount of light at desk height should be about 50 footcandles. Parking garages reguire about 5 foot candles. 1 footcandle is good for street lighting. A unit of measure of the intensity of light falling on a surface, equal to one lumen per square foot and originally defined with reference to a standardized candle burning at one foot from a given surface.
