I purchased a 14 watt LED “soft white” light bulb with an output of 1600 lumens and provides light output equivalent to a 100 watt incandescent light bulb. The A19 form factor bulb is designed to operate on a standard 120 Vrms 60 Hz power line. choose the right option inside the parenthesis (a) The “soft white” output corresponds to a black body radiator with a thermal temperature equivalent to approximately (1000K, 2700-3000K, 5000K to 5500K) while the “bright white” fluorescent lighting in a classroom corresponds to a black body radiator with a thermal temperature equivalent to approximately (1000K, 2700-3000K, 4500K to 5500K) (b) This bulb uses a number of individual LEDs emitting in the (4200Å, 6500Å, 7300Å) wavelength range which corresponds to the (red, orange, yellow green, blue) end of the visible spectrum and the material used is probably (GaAs, GaAlAs, GaN, Si, SiO2). To yield “soft white” illumination, a (green, red, yellow, infrared, UV) phosphor is used as a coating on the LEDs. (c) The “efficacy” of this 14 watt LED bulb with a light output of 1600 lumens is approximately (5-10, 15-20, 25, 50, 80, 100, 115, 150) and this compares to the “efficacy” of about (5-10, 15-20, 25, 50, 80, 100, 115, 150) for a 100 watt incandescent light bulb with the same 1600 lumen output. (d) Compute the current required to operate this 14 watt LED bulb from the 120 Vrms 60 Hz power line (__________) and compute the current ( ____________) required to operate the 100 watt incandescent bulb from the 120 Vrms 60 Hz power line
I purchased a 14 watt LED “soft white” light bulb with an output of
1600 lumens and provides light output equivalent to a 100 watt incandescent light bulb. The A19 form factor bulb is designed to
operate on a standard 120 Vrms 60 Hz power line.
choose the right option inside the parenthesis
(a) The “soft white” output corresponds to a black body radiator with a thermal temperature equivalent to approximately
(1000K, 2700-3000K, 5000K to 5500K) while the “bright white” fluorescent lighting in a classroom corresponds to a black
body radiator with a thermal temperature equivalent to approximately (1000K, 2700-3000K, 4500K to 5500K)
(b) This bulb uses a number of individual LEDs emitting in the (4200Å, 6500Å, 7300Å) wavelength range which corresponds to
the (red, orange, yellow green, blue) end of the visible spectrum and the material used is probably
(GaAs, GaAlAs, GaN, Si, SiO2). To yield “soft white” illumination, a (green, red, yellow, infrared, UV) phosphor is used
as a coating on the LEDs.
(c) The “efficacy” of this 14 watt LED bulb with a light output of 1600 lumens is approximately
(5-10, 15-20, 25, 50, 80, 100, 115, 150) and this compares to the “efficacy” of about (5-10, 15-20, 25, 50, 80, 100, 115, 150) for
a 100 watt incandescent light bulb with the same 1600 lumen output.
(d) Compute the current required to operate this 14 watt LED bulb from the 120 Vrms 60 Hz power line (__________) and
compute the current ( ____________) required to operate the 100 watt incandescent bulb from the 120 Vrms 60 Hz power line
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