You are now visiting our Global professional lighting website, visit your local website by
going to the USA website
More brands from
Philips Lighting
Lighting
Support
For professionals
For consumers
Products
Products
Lighting products
Lighting products
Product catalog
Indoor luminaires
Outdoor luminaires
LED Lamps and Tubes
Conventional lamps and tubes
Lighting electronics
Lighting controls
Consumer lighting
OEM products
Specialist applications
Specialist applications
Automotive
Aquaculture
Digital projection
Entertainment
Horticulture
Luminous textile
OneSpace luminous ceiling
Solar powered
Special lighting
Urban inspiration
Highlighted products
Highlighted products
Coreline
Freestreet
Iridium gen3
LED lamps
LED tube
Ledinaire
MasterColour CDM lamps
Metronomis LED
MASTERColour CDM MW eco
TrueForce
System areas
System areas
Public Spaces systems
Public Spaces systems
Roads & streets
Tunnels
Arena & stadiums
Recreational sports
Parks & plazas
Bridges, monuments & facades
Education
Airports
Municipal buildings
Office and industry systems
Office and industry systems
Office
Industry
Parking
Healthcare
Retail and hospitality systems
Retail and hospitality systems
Food & large retailers
Fashion
Petrol & convenience stores
Hospitality
Shopping malls
Museums
Services
Services
Lighting services
Financial services
Inspiration
Inspiration
Inspiration
Inspiration
Case studies
Lighting Technology
Events
Luminous magazine
Pioneers of light
Co-creation
Beyond Illumination
Beyond Illumination
Light Beyond Illumination
Smart Cities
Smart Retail
Smart Buildings
What is Connected Lighting?
Education
Education
Education
Education
Lighting University
LED lighting
Indoor LED lighting
LED street lighting
Conventional lighting
White Papers
Support & Contact
Support & Contact
Purchase
Purchase
Installer Program
Partners
Tradelink
Where to buy
Support
Support
Tools
FAQs
Warranty and legislation
Connect
Connect
Contact us
About
About
About
About
About Signify
For professionals
For consumers
GLOBAL
...
Home
Support
Product Support
Frequently Asked Questions
5. Life and Light output
Suggestions
Suggested results
FAQ
< Back to FAQ overview
Life and Light output
How long do LEDs really last? What happens to the light output?
What does a life of 50,000 hours mean in the case of - LEDs?
Why is the life of LEDs measured as lumen depreciation?
What are the factors that affect the lifespan of the LEDs?
Is lifespan reduced if the LEDs are frequently turned on and off?
How much longer does an LED last than a conventional light source?
What is the best way to compare the output of LEDs with other light sources?
Does increasing the wattage of LEDs increase their output?
Why are LEDs considered more efficient than conventional light sources?
What is the difference between absolute photometry and relative photometry?
Why is it necessary to use absolute photometry for LEDs?
What are “cold” and “hot” lumens?
Other
questions
General questions
Industry standards
Dimming with LEDs
LED light fittings
How do LEDs produce light
The environment
Retrofit Lamps
White light and color
Technical FAQs