Smart dimming circuit used in solid state lightings suitable for skygazer

Keiichi Sakai

doi:10.1117/12.906293

6 February 2012 Smart dimming circuit used in solid state lightings suitable for skygazer

Keiichi Sakai

Proceedings Volume 8278, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI; 827804 (2012) https://doi.org/10.1117/12.906293
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

A skygazer is an astronomical visual observer who uses telescopes in a field. The lighting for them is important. Their requirements are solid-state, light weight, flicker-less, and dimming controls corresponding to photopic, mesopic and scotopic vision. Especially, the lighting never spoils a dark adaptation at moonless night. However, bright light is used to preparing the equipment at twilight. To satisfy their requirements, we clearly define the illuminance range and its wave length, and then we propose smart dimming. The main idea is the dimming method using PAM and the implementation to MCU sharing the DC-DC converter with LEDs. The next idea is efficient use of MCU built-in components.

Citation Download Citation

Keiichi Sakai "Smart dimming circuit used in solid state lightings suitable for skygazer", Proc. SPIE 8278, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI, 827804 (6 February 2012); https://doi.org/10.1117/12.906293

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