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After about eight years and a similar failure last year, this came as no surprise: It’s a W5W “parking light” in the same fixture as the melty halogen high-beam bulbs (used as daytime running lights at half power), so it gets toasted on those occasions when we drive somewhere. The adhesive holding the LED strip…
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I expected the line to pass through the origin, which it most certainly does not
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The RMS numbers may not have any significant figures.
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There’s definitely not much benefit in driving the tube beyond about 60% PWM
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At 30% PWM the beam current looks a bit more reasonable
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The bottom trace (green, channel 4) is the laser tube current
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Eyeballometrically, the hole falls within the (dimmed) spot diameter
The Smell of Molten Projects in the Morning 