What does LLF mean in lighting?
Light Loss Factor
• This is accounted for by using a Light Loss Factor (LLF) during the design process. • A Light Loss Factor is a multiplier that is used to predict future performance (maintained illuminance) based on the initial properties of a lighting system. • LLF = 1 – Expected Depreciation.
How is LLF calculated?
LLF = .85 = RSDD x LDD x BF x LLD LLF (Light Loss Factor) is the product of several factors, each depreciating light output at certain point in time in the future compared to initial light output. LDD takes into account the dirt accumulation on the lens or other components of the luminaire that may reduce light output.
What does LLD mean in lighting?
lamp lumen depreciation (LLD) The process of a lamp steadily emitting less light over time, even though its energy consumption remains constant.
What is L80 in lighting?
L80 : It means that a minimum of 80% of the luminous flux will be maintained for a defined period given the maximum ambient temperature.
How many watts is 1200 lumens?
75 W
Watts to Lumens Comparison
| Power | Light bulb | Halogen lamp |
|---|---|---|
| 25 W | 230 lm | 300 lm |
| 40 W | 430 lm | 500 lm |
| 60 W | 730 lm | 900 lm |
| 75 W | 970 lm | 1200 lm |
What is a ballast factor?
A ballast factor is a number, typically between 0.70 and 1.2, that tells you how much light a lamp will emit with that ballast. So how do you get that number? Ballast factor is calculated by dividing the lumen output of a lamp-ballast combination by the lumen output of the same lamp(s) on a reference ballast.
What is RCR in lighting?
Room Cavity Ratio (RCR) LIGHTING: A shape factor (for a room, etc.) used in lighting calculations. RCR = 5H (L+W) / L x W, or, alternately, RCR = (2.5) Total Wall Area / Floor Area.
What does FRS stand for?
abbreviation for Financial Reporting Standard : one of the rules on how companies should give financial information about their activities: The company provided a statement of total recognised gains and losses, as required by FRS 3. BANKING, FINANCE, GOVERNMENT. abbreviation for the Federal Reserve System.
What does LLDD mean?
students with special educational needs (SEN) tend to be referred to as ‘learners with. learning difficulties or disabilities’ or LLDD.
What does L70 B50 mean?
L70 B50 – at the specified hours (50,000 for example) this test shows 50% of the light sources with more than 70% light output while the remaining 50% have less than 70% of their output.
What does l80 B50 mean?
The value B50 indicates that the declared L-value will be achieved by minimum 50 % of the LED modules and that the remaining 50% may have a lower lumen value.
Is 3000 lumens too bright?
3000 lumens is a good level of light for LED, CFL or incandescent lighting. It’s suitable for recessed lighting, downlighting, up lighting and within pendants.