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Friday, June 22, 2012

Light Falloff

TBD

Ref. http://diyphotography.net/light-falloff-cheat-sheet-card

Monday, June 18, 2012

Efficacy in Lighting

조명 디자인에서, 'efficacy'는 광원에서 생산된 빛의 량을 이야기한다. 이것의 단위는 루멘스(lumens)이며 그 빛이 량을 생산하기 위해 소모된 파워의 비율을 나타낸다. 이것은 efficiency와 혼동해서는 안된다. Efficiency는 입력과 출력의 무차원의 비율로서 가시 광선의 파워를 소모된 파워의 비율로 나타낸것이다. 가시 광선의 파워는 필라멘트의 온도에서 흑체에 대하여 플랑크 커브를 300nm와 700nm사이를 적분한 것에 의해서 그 흑체 커브 아래의 총 파워의 비율로 근사화될 수 있다. 열원에 대한 빛의 efficiency는 전형적으로 2%보다 작다.

http://en.wikipedia.org/wiki/Efficacy#Lighting
http://en.wikipedia.org/wiki/Luminous_efficacy

Tuesday, June 12, 2012

Ultimate Ears TripleFi 10 Noise-Isolating Earphones NIB








Ultimate Ears TripleFi 10 Noise-Isolating Earphones

UE TripleFi 10-Gallery Lg1 750x239

UE TripleFi 10-Gallery Lg2 750x239

UE TripleFi 10-Gallery Lg3 750x239

TripleFi 10 Earphones

UE TripleFi 10-Gallery Lg5 750x239


Technical Specifications & Guides
Technical specifications & user guide
Earphone Type: In-ear
Driver type: Triple armature
Frequency response: 10 Hz – 17 kHz
Impedance: 32 ohms, 1 kHz
Sensitivity: 117 dB SPL/mW, 1 kHz
Noise isolation: -26 dB
Warranty: 2 years
Compatibility
Smartphones: iPhone, Blackberry and other phones with standard 3.5 mm jack
Portable media players: iPod and MP3, video and DVD players with standard 3.5 mm jack
Laptops and computers: Laptops and computers with standard 3.5 mm jack
Home audio: Home audio systems with standard 3.5 mm jack
Gaming consoles: Gaming consoles with standard 3.5 mm jack
Connection
Cable length: 46 inch (116.8 cm)
Input type: Angled
Input connector: 1/8 inch (3.5mm), gold-plated


In the box

Accessories included with your Ultimate Ears TripleFi 10s.

Crush-proof case
The brushed metallic, 3” x 3”, hard case safely stores your earphones and slips easily into a pocket or bag.

Ear cushions
You get three sizes of soft silicone ear cushions (S, M, L) and two sets of Comply™ Foam Tips.

Extender Cable
You've got room to move with this 18" (45.7cm) extender cable for your Ultimate Ears earphones.

Cleaning tool
Keep your earphones looking—and sounding—their best.

1/4" adapter jack
You can use the included adapter to connect your TripleFi 10s to professional or home stereo equipment.

Sound-level attenuator
The attenuator lowers the overall volume levels for noisy sound sources such as on airplanes.


http://www.logitech.com/en-us/ue/ue-earphones/triplefi-10

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