Build a complete lumen loss budget for any LED luminaire — from driver input to delivered lumens on the target surface. Enable or disable each stage in the optical chain, adjust losses at every element, and see a full waterfall diagram showing exactly where lumens are being lost.
Input — driver and LED source
Mains input watts to the driver
LED output lm per watt of LED input power
Optical chain — toggle each element on or off
Primary optic (lens on LED)
-5%
Secondary optic (reflector / TIR / diffuser)
-20%
Luminaire housing / body losses
-5%
Cover glass / diffuser panel
not included
Soiling and maintenance factor
-10%
LED lumen depreciation (L70 / tq)
-5%
Delivered lumens (maintained)
0 lm
0 lm
Source (bare LED)
0%
Overall LOR
0 lm/W
System efficacy
0 lm
Lumens lost
Lumen budget waterfall — source to target
Optical loss flow diagram
Configuration comparison — same LED source
Reducing optical losses
Driver input
LED output (bare)
Active optical stages
Combined optical efficiency
Delivered lumens (maintained)
System efficacy (wall to light)
Largest loss stage
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