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https://www.timeanddate.com/time/change/usa
Sunday, November 7, 2021, 1:00:00 am local standard time instead. Sunrise and sunset will be about 1 hour earlier on Nov 7, 2021 than the day before. There will be more light in the morning. Also called Fall Back and Winter Time. More info: Daylight Saving Time Ends in USA & CanadaAbbreviations: US, USA
https://www.timeanddate.com/time/change/usa/san-diego
Mar 14, 2021 - Daylight Saving Time Started. When local standard time was about to reach. Sunday, March 14, 2021, 2:00:00 am clocks were turned forward 1 hour to. Sunday, March 14, 2021, 3:00:00 am local daylight time instead. Sunrise and sunset were about 1 hour later on Mar 14, 2021 than the day before. There was more light in the evening.
https://www.sandiego.gov/sites/default/files/legacy/planning/community/pdf/cpc/agendas/attachments/outdoorlighting.pdf
light pollution; and (4) Illuminated on-premises signs for businesses that are open to the public after 11:00 p.m. may remain lighted during business operating hours only. Illuminated off-premises advertising display signs shall not be lighted after 11:00 p.m. Signs located both on- and off-premises shall be equipped with automatic timing devices.File Size: 25KB
http://www.timebie.com/sun/sandiegoca.php
Month Day Week Day Sun Rise Time Sun Set Time Daylight Hours Sep 1 Wed 6:23 19:15 (7:15 PM) 12 hrs 52 mins; Sep 2 Thu 6:23 19:14 (7:14 PM) 12 hrs
https://www.lighting.philips.com/main/support/support/faqs/life-and-light-output/a-life-of-50000-hours
50,000 hours would imply 5.7 years if the light is operated for 24 hours in a day, 7.6 years if the lights are on 18 hours per day and 11.4 years for 12 hours a day. Choose your type of question 1.
http://www.parsource.com/content/light-unit-conversion-table
Quanta of light in PAR range: Horticulture research: 0.02: 0.013: 0.015: moles/day (PAR) "daily light integral": accumulated PAR light during an entire day: Horticulture research x hours of light: footcandle x 0.00071 x hours of light: footcandle x 0.00047 x hours of light: footcandle x 0.00054: Watts/m.2 (total energy) Total energy: Engineers, research: 0.101: 0.074: 0.089
https://www.sandiego.gov/development-services/codes-regulations
The State of California has adopted and amended the new building standard codes into the 2016 edition with an effective date of Jan. 1, 2017. Local amendments to the 2016 edition are in effect for construction permit applications submitted and deemed complete on or after Feb. 17, 2018.
https://www.testextextile.com/common-questions-during-light-fastness-test-iso-105-b02-and-aatcc-16/
Nov 15, 2019 · – Light source life : More than 2,000 hours – Use environment : It should be possible to test setting in accordance with various standards. It should be possible to set the desired test time and test light. After the test is over, it stops automatically and the equipment should move to the initial mode.
https://www.ledlight.com/LED-Information.aspx
The standard incandescent light bulb last 1,500 hours. LED Lights are shock and vibration resistant. LED lighting has a constant glow and does not flicker like the other types of lights.
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