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Vinyl microgroove phonograph records typically yield 55-65 dB, though the first play of the higher-fidelity outer rings can achieve a dynamic range of 70 dB. [25] German magnetic tape in 1941 was reported to have had a dynamic range of 60 dB, [26] though modern-day restoration experts of such tapes note 45-50 dB as the observed dynamic range. [27]
Comparison of SMD LED modules used on an LED strip light [1] ... 35–50 70–80 70 100 Monochrome 5736 ... 60–70 3 120 no 70 100 3030 3.0 × 3.0 0.9 110–120
The efficiency of this type of HP-LED is typically 40 lm/W. [54] A large number of LED elements in series may be able to operate directly from line voltage. In 2009, Seoul Semiconductor released a high DC voltage LED, named 'Acrich MJT', capable of being driven from AC power with a simple controlling circuit.
LED power dissipation is modeled as a current source; thermal resistance is modeled as a resistor; and the ambient temperature is modeled as a voltage source. High power light-emitting diodes (LEDs) can use 350 milliwatts or more in a single LED. Most of the electricity in an LED becomes heat rather than light – about 70% heat and 30% light. [1]
Typical dependence of the fibre-coupled optical power vs. injected current for a SLED module with a central wavelength of 1550 nm, a 3-dB bandwidth of 60 nm and a typical output power of 1.5 mW at 20 °C. The total optical power emitted by an SLED depends on the drive current. Unlike laser diodes, the output intensity does not exhibit a sharp ...
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