Dec 3, 2011 #1 M mustang51 0 Joined Jun 15, 2011 Messages 19 Points 0 How can I measure how many lumens my flashlight has? is there some kind of meter capable of measuring lumens?
How can I measure how many lumens my flashlight has? is there some kind of meter capable of measuring lumens?
Dec 3, 2011 #2 aryntha 0 Joined Nov 17, 2009 Messages 2,031 Points 83 "Lumens", no. Not with a simple meter. It requires a spherical integration meter. These are...rather expensive, and not common. Labsphere : Light Measurement Spheres Complete systems for this, or handheld units, you're talking $3000 and up. Candlepower/candela/foot-candles on the other hand is easier, but not really nearly as telling or comparable across different lights.
"Lumens", no. Not with a simple meter. It requires a spherical integration meter. These are...rather expensive, and not common. Labsphere : Light Measurement Spheres Complete systems for this, or handheld units, you're talking $3000 and up. Candlepower/candela/foot-candles on the other hand is easier, but not really nearly as telling or comparable across different lights.
Dec 3, 2011 #3 M mustang51 0 Joined Jun 15, 2011 Messages 19 Points 0 So how do I know if the flash light I built is really 1000 lumens and not less?
Dec 3, 2011 #4 Blord 0 Joined Dec 24, 2007 Messages 5,356 Points 0 If you know the LED and the current you can compare to this list. Quick reference list of common powerleds brightness bins at Tj=25C Actual brightness will be around 10% less due to heating of the led. Cree XR-E, XP-E & XP-G brightness at 350mA P4 80.6-87.4 lm @ 350mA Q2 87.4-93.9 lm @ 350mA Q3 93.9-100 lm @ 350mA Q4 100-107 lm @ 350mA Q5 107-114 lm @ 350mA R2 114-122 lm @ 350mA R3 122-130 lm @ 350mA R4 130-139 lm @ 350mA R5 139-148 lm @ 350mA S2 148-156 lm @ 350mA S3 156-164 lm @ 350mA S4 164-172 lm @ 350mA Cree XR-E and XP-E brightness at 1A P4 177-192 lm @ 1A Q2 192-207 lm @ 1A Q3 207-220 lm @ 1A Q4 220-233 lm @ 1A Q5 233-251 lm @ 1A R2 251-268 lm @ 1A R3 268-286 lm @ 1A* R4 286-306 lm @ 1A Cree XP-G brightness at 1A R2 285-305 lm @ 1A R3 305-325 lm @ 1A R4 325-348 lm @ 1A R5 348-370 lm @ 1A S2 370-390 lm @ 1A S3 390-410 lm @ 1A* S4 410-430 lm @ 1A Cree XP-G brightness at 1.5A R2 380-406 lm @ 1.5A R3 406-433 lm @ 1.5A R4 433-463 lm @ 1.5A R5 463-493 lm @ 1.5A S2 493-520 lm @ 1.5A S3 520-547 lm @ 1.5A* S4 547-573 lm @ 1.5A Cree XM-L brightness at 700mA T5 260-280 lm @ 700mA T6 280-300 lm @ 700mA* U2 300-320 lm @ 700mA U3 320-340 lm @ 700mA Cree XM-L brightness at 1.5A T5 504-543 lm @ 1.5A T6 543-582 lm @ 1.5A* U2 582-621 lm @ 1.5A U3 621-660 lm @ 1.5A Cree XM-L brightness at 3.oA T5 845-910 lm @ 3.0A T6 910-975 lm @ 3.0A* U2 975-1040 lm @ 3.0A U3 1040-1105 lm @ 3.0A Cree MC-E brightness at 350mA per die, 1.4A total current H 280-320 lm @ 350mA (1.4A) J 320-370 lm @ 350mA (1.4A) K 370-430 lm @ 350mA (1.4A) M 430-490 lm @ 350mA (1.4A) N 490-550 lm @ 350mA (1.4A)* P 550-620 lm @ 350mA (1.4A) MC-E brightness at 700mA per die, 2.8A total current H 490-560 lm @ 700mA (2.8A) J 560-648 lm @ 700mA (2.8A) K 648-753 lm @ 700mA (2.8A) M 753-858 lm @ 700mA (2.8A) N 858-962 lm @ 700mA (2.8A)* P 962-1085 lm @ 700mA (2.8A) Luminus SST-50 brightness at 1.75A, 350mA per mm² F 275-350 lm @ 1.75A (350mA/mm²) G 350-425 lm @ 1.75A (350mA/mm²) H 425-500 lm @ 1.75A (350mA/mm²) J 500-600 lm @ 1.75A (350mA/mm²)* K 600-700 lm @ 1.75A (350mA/mm²) Luminus SST-50 brightness at 2.8A, 560mA per mm² F 454-576 lm @ 2.8A (560mA/mm²) G 576-701 lm @ 2.8A (560mA/mm²) H 701-825 lm @ 2.8A (560mA/mm²) J 825-990 lm @ 2.8A (560mA/mm²)* K 990-1155 lm @ 2.8A (560mA/mm²) Luminus SST-50 brightness at 5A, 1A per mm² F 743-945 lm @ 5A (1A/mm²) G 945-1148 lm @ 5A (1A/mm²) H 1148-1350 lm @ 5A (1A/mm²) J 1350-1620 lm @ 5A (1A/mm²)* K 1620-1890 lm @ 5A (1A/mm²) Luminus SST-90 brightness at 3.15A, 350mA per mm² K 600-700 lm @ 3.15A (350mA/mm²) L 700-850 lm @ 3.15A (350mA/mm²) M 850-1000 lm @ 3.15A (350mA/mm²) N 1000-1200 lm @ 3.15A (350mA/mm²)* P 1200-1450 lm @ 3.15A (350mA/mm²) Luminus SST-90 brightness at 5A, 560mA per mm² K 930-1085 lm @ 5A (560mA/mm²) L 1085-1318 lm @ 5A (560mA/mm²) M 1318-1550 lm @ 5A (560mA/mm²) N 1550-1860 lm @ 5A (560mA/mm²)* P 1860-2248 lm @ 5A (560mA/mm²) Luminus SST-90 brightness at 9A, 1A per mm² K 1620-1890 lm @ 9A (1A/mm²) L 1890-2295 lm @ 9A (1A/mm²) M 2295-2700 lm @ 9A (1A/mm²) N 2700-3240 lm @ 9A (1A/mm²)* P 3240-3915 lm @ 9A (1A/mm²) Seoul SemiConductor P4 brightness at 350mA S1 54-60 lm @ 350mA S2 60-70 lm @ 350mA T1 70-80 lm @ 350mA T2 80-91 lm @ 350mA U1 91-100 lm @ 350mA U2 100-109 lm @ 350mA* U3 109-119 lm @ 350mA Seoul SemiConductor P4 brightness at 1A S1 127-141 lm @ 1A S2 141-165 lm @ 1A T1 165-188 lm @ 1A T2 188-214 lm @ 1A U1 214-235 lm @ 1A U2 235-256 lm @ 1A* U3 256-280 lm @ 1A Seoul SemiConductor P7 brightness at 1.4A total current, 350mA per die A 251-326 lm @ 1.4A (350mA) B 326-400 lm @ 1.4A (350mA) C 400-457 lm @ 1.4A (350mA) D 457-514 lm @ 1.4A (350mA)* E 514-629 lm @ 1.4A (350mA) Seoul SemiConductor P7 brightness at 2.8A total current, 700mA per die A 440-570 lm @ 2.8A (700mA) B 570-700 lm @ 2.8A (700mA) C 700-800 lm @ 2.8A (700mA) D 800-900 lm @ 2.8A (700mA)* E 900-1100 lm @ 2.8A (700mA) Lumileds Luxeon Rebel brightness at 350mA 040 40+ lm @ 350mA 050 50+ lm @ 350mA 060 60+ lm @ 350mA 070 70+ lm @ 350mA 080 80+ lm @ 350mA 090 90+ lm @ 350mA 100 100+ lm @ 350mA* 110 110+ lm @ 350mA Lumileds Luxeon Rebel brightness at 1A 040 84+ lm @ 1A 050 105+ lm @ 1A 060 126+ lm @ 1A 070 147+ lm @ 1A 080 168+ lm @ 1A 090 189+ lm @ 1A 100 210+ lm @ 1A* 110 231+ lm @ 1A *(maximum available flux bin as of writing) Sources: CREE | Lighting LEDs Documentation http://www.luminus.com/content1454 Seoul Semiconductor, Inc LUXEON Rebel White LEDs | Philips Lumileds Lighting Company
If you know the LED and the current you can compare to this list. Quick reference list of common powerleds brightness bins at Tj=25C Actual brightness will be around 10% less due to heating of the led. Cree XR-E, XP-E & XP-G brightness at 350mA P4 80.6-87.4 lm @ 350mA Q2 87.4-93.9 lm @ 350mA Q3 93.9-100 lm @ 350mA Q4 100-107 lm @ 350mA Q5 107-114 lm @ 350mA R2 114-122 lm @ 350mA R3 122-130 lm @ 350mA R4 130-139 lm @ 350mA R5 139-148 lm @ 350mA S2 148-156 lm @ 350mA S3 156-164 lm @ 350mA S4 164-172 lm @ 350mA Cree XR-E and XP-E brightness at 1A P4 177-192 lm @ 1A Q2 192-207 lm @ 1A Q3 207-220 lm @ 1A Q4 220-233 lm @ 1A Q5 233-251 lm @ 1A R2 251-268 lm @ 1A R3 268-286 lm @ 1A* R4 286-306 lm @ 1A Cree XP-G brightness at 1A R2 285-305 lm @ 1A R3 305-325 lm @ 1A R4 325-348 lm @ 1A R5 348-370 lm @ 1A S2 370-390 lm @ 1A S3 390-410 lm @ 1A* S4 410-430 lm @ 1A Cree XP-G brightness at 1.5A R2 380-406 lm @ 1.5A R3 406-433 lm @ 1.5A R4 433-463 lm @ 1.5A R5 463-493 lm @ 1.5A S2 493-520 lm @ 1.5A S3 520-547 lm @ 1.5A* S4 547-573 lm @ 1.5A Cree XM-L brightness at 700mA T5 260-280 lm @ 700mA T6 280-300 lm @ 700mA* U2 300-320 lm @ 700mA U3 320-340 lm @ 700mA Cree XM-L brightness at 1.5A T5 504-543 lm @ 1.5A T6 543-582 lm @ 1.5A* U2 582-621 lm @ 1.5A U3 621-660 lm @ 1.5A Cree XM-L brightness at 3.oA T5 845-910 lm @ 3.0A T6 910-975 lm @ 3.0A* U2 975-1040 lm @ 3.0A U3 1040-1105 lm @ 3.0A Cree MC-E brightness at 350mA per die, 1.4A total current H 280-320 lm @ 350mA (1.4A) J 320-370 lm @ 350mA (1.4A) K 370-430 lm @ 350mA (1.4A) M 430-490 lm @ 350mA (1.4A) N 490-550 lm @ 350mA (1.4A)* P 550-620 lm @ 350mA (1.4A) MC-E brightness at 700mA per die, 2.8A total current H 490-560 lm @ 700mA (2.8A) J 560-648 lm @ 700mA (2.8A) K 648-753 lm @ 700mA (2.8A) M 753-858 lm @ 700mA (2.8A) N 858-962 lm @ 700mA (2.8A)* P 962-1085 lm @ 700mA (2.8A) Luminus SST-50 brightness at 1.75A, 350mA per mm² F 275-350 lm @ 1.75A (350mA/mm²) G 350-425 lm @ 1.75A (350mA/mm²) H 425-500 lm @ 1.75A (350mA/mm²) J 500-600 lm @ 1.75A (350mA/mm²)* K 600-700 lm @ 1.75A (350mA/mm²) Luminus SST-50 brightness at 2.8A, 560mA per mm² F 454-576 lm @ 2.8A (560mA/mm²) G 576-701 lm @ 2.8A (560mA/mm²) H 701-825 lm @ 2.8A (560mA/mm²) J 825-990 lm @ 2.8A (560mA/mm²)* K 990-1155 lm @ 2.8A (560mA/mm²) Luminus SST-50 brightness at 5A, 1A per mm² F 743-945 lm @ 5A (1A/mm²) G 945-1148 lm @ 5A (1A/mm²) H 1148-1350 lm @ 5A (1A/mm²) J 1350-1620 lm @ 5A (1A/mm²)* K 1620-1890 lm @ 5A (1A/mm²) Luminus SST-90 brightness at 3.15A, 350mA per mm² K 600-700 lm @ 3.15A (350mA/mm²) L 700-850 lm @ 3.15A (350mA/mm²) M 850-1000 lm @ 3.15A (350mA/mm²) N 1000-1200 lm @ 3.15A (350mA/mm²)* P 1200-1450 lm @ 3.15A (350mA/mm²) Luminus SST-90 brightness at 5A, 560mA per mm² K 930-1085 lm @ 5A (560mA/mm²) L 1085-1318 lm @ 5A (560mA/mm²) M 1318-1550 lm @ 5A (560mA/mm²) N 1550-1860 lm @ 5A (560mA/mm²)* P 1860-2248 lm @ 5A (560mA/mm²) Luminus SST-90 brightness at 9A, 1A per mm² K 1620-1890 lm @ 9A (1A/mm²) L 1890-2295 lm @ 9A (1A/mm²) M 2295-2700 lm @ 9A (1A/mm²) N 2700-3240 lm @ 9A (1A/mm²)* P 3240-3915 lm @ 9A (1A/mm²) Seoul SemiConductor P4 brightness at 350mA S1 54-60 lm @ 350mA S2 60-70 lm @ 350mA T1 70-80 lm @ 350mA T2 80-91 lm @ 350mA U1 91-100 lm @ 350mA U2 100-109 lm @ 350mA* U3 109-119 lm @ 350mA Seoul SemiConductor P4 brightness at 1A S1 127-141 lm @ 1A S2 141-165 lm @ 1A T1 165-188 lm @ 1A T2 188-214 lm @ 1A U1 214-235 lm @ 1A U2 235-256 lm @ 1A* U3 256-280 lm @ 1A Seoul SemiConductor P7 brightness at 1.4A total current, 350mA per die A 251-326 lm @ 1.4A (350mA) B 326-400 lm @ 1.4A (350mA) C 400-457 lm @ 1.4A (350mA) D 457-514 lm @ 1.4A (350mA)* E 514-629 lm @ 1.4A (350mA) Seoul SemiConductor P7 brightness at 2.8A total current, 700mA per die A 440-570 lm @ 2.8A (700mA) B 570-700 lm @ 2.8A (700mA) C 700-800 lm @ 2.8A (700mA) D 800-900 lm @ 2.8A (700mA)* E 900-1100 lm @ 2.8A (700mA) Lumileds Luxeon Rebel brightness at 350mA 040 40+ lm @ 350mA 050 50+ lm @ 350mA 060 60+ lm @ 350mA 070 70+ lm @ 350mA 080 80+ lm @ 350mA 090 90+ lm @ 350mA 100 100+ lm @ 350mA* 110 110+ lm @ 350mA Lumileds Luxeon Rebel brightness at 1A 040 84+ lm @ 1A 050 105+ lm @ 1A 060 126+ lm @ 1A 070 147+ lm @ 1A 080 168+ lm @ 1A 090 189+ lm @ 1A 100 210+ lm @ 1A* 110 231+ lm @ 1A *(maximum available flux bin as of writing) Sources: CREE | Lighting LEDs Documentation http://www.luminus.com/content1454 Seoul Semiconductor, Inc LUXEON Rebel White LEDs | Philips Lumileds Lighting Company
Dec 3, 2011 #5 HaloBlu 0 Joined Dec 27, 2009 Messages 1,321 Points 0 Don't know how well they compare but people do build DIY integrating spheres. You need a good coating. Improving the DIY integrating sphere
Don't know how well they compare but people do build DIY integrating spheres. You need a good coating. Improving the DIY integrating sphere
Dec 3, 2011 #6 M mustang51 0 Joined Jun 15, 2011 Messages 19 Points 0 My LED is a XM-L-H it suppose to be a 1000 lumen LED @ 3000mA.