Monitor Response Time: GtG vs MPRT and What 1ms Really Means
The 1ms on a spec sheet is almost always GtG, but what you actually see is governed by MPRT. At 240Hz, motion blur measures about 4.2 pixels. Here is the math behind both numbers.
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#구매 가이드 8 posts
ANSI Lumens vs Lumens: Why an 8,000-Lumen Projector Was Dimmer
A projector labeled 8,000 lumens measured 251 lux while a 200 ANSI-lumen model hit 477 lux. What ANSI lumens actually measure, why plain lumen ratings cannot be compared, and how many lumens each screen size needs.
Power Bank mAh to Wh: Korea's 160Wh, Two-Unit Cabin Rule
The cabin limit for power banks is 160Wh, roughly 43,000mAh. Since 20 April 2026 it is two units per passenger, and in-flight charging is banned. Here is the mAh-to-Wh maths behind it.
PCIe Gen4 vs Gen5 SSD: When Double the Bandwidth Does Nothing
A PCIe 5.0 SSD reads sequentially at 14,800MB/s, roughly double a Gen4 drive. Measured game load times differ by under 0.2 seconds. Here is the bandwidth, heat and endurance math that explains the gap between the two facts.
DisplayHDR 400 vs 600 vs 1000: What Each VESA Tier Actually Requires
DisplayHDR 400 does not require local dimming at all. Run the VESA certification numbers tier by tier and the real dividing line between 400, 600 and 1000 is not peak brightness — it is the black level.
Air Purifier Sizing: Why 130% Coverage Can Fall Short
The '30-pyeong' label on a purifier is not your home's floor area — it is rated coverage derived from CADR. For the same 33㎡ living room, Korea's 130% rule asks for CADR 5.6 while US guidance asks for 10.1.
TV Viewing Distance: What Size Fits 2.5 Meters?
The right TV size falls between viewing distance ÷ 1.63 and ÷ 1.20. At 2.5 meters that is 60 to 82 inches. A 65-inch 4K panel resolves individual pixels only within 1.3 meters — well inside where most sofas sit.
Cordless Vacuum Suction in AW — Don't Be Fooled by Pa Numbers
For cordless vacuums, 150AW or more is sufficient for a primary vacuum. A government survey found that only 3 out of 10 products met their stated suction power — and 6 were labeling pascal (Pa), a pressure unit, as if it were suction power.