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How to get a right LED replacement?
We need to take lighting fixture efficiency, power efficiency, Effective illumination efficiency, as well as lighting source efficiency in our consideration, when think about LED replacements.
According to CIE's suggestions, direct lighting luminaire has lighting fixture efficiency of 90-100%, semi-direct lighting luminaire has 60-90%, diffused lighting luminaire has 40-60%, semi-indirect lighting luminaire has 10-40%, and indirect lighting luminaire has less than 10%. While the common lighting luminaire like spot lights have 40%-55% fixture efficiency, flood lights have 55-70%, florescent lights have 40-55% and LED have 80-90%.
|
Lighting source |
LED |
Incandescent |
CFL |
Sodium |
Halogen |
|
Light efficiency |
90LM/W |
20LM/W |
80LM/W |
100LM/W |
80LM/W |
|
power efficiency |
90% |
100% |
85% |
90% |
95% |
|
Effective Rate |
90% |
60% |
60% |
60% |
30% |
|
Fixture Rate |
90% |
60% |
60% |
60% |
50% |
|
Actual |
65LM/W |
7LM/W |
24LM/W |
32LM/W |
11LM/W |
For brightness, eyes on lumens, not watts. Lumens indicate light output. Watts indicate energy consumed.
From this form, you may get some idea of the LED replacements.
Eg. You want to replace a 50W halogen, with actual lighting lumens of about 500LM; an 7W or 10W LED downlight can meet the needs, with more than 500LM.
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