A 600W 24V switching power supply pulls 25A at full load. That number is the whole problem. It is also the number most spec sheets bury somewhere belo[……]
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The 20% headroom rule is not about future expansion. It is about keeping the driver between 60% and 80% load, which is where both the efficiency curve[……]
24 V is not automatically the better choice. Below about 3 metres and 30 W per run, 12 V modules cost less and you gain nothing from 24 V. The math be[……]
IP68 is a worse buying decision than IP67, and the reason is uncomfortable: IP68 has no standardised test. Under IEC 60529, IP68 means only “deeper th[……]
100% burn-in is the dividing line in this industry. Full-load burn-in costs roughly 3–5% of unit cost in electricity, rack space and labour. Factories[……]
Efficiency is the number everyone compares and the number that matters least. Going from 90% to 93% on a 200 W sign running 12 hours a day saves about[……]
Housing customisation is the worst-value lever on this list. It costs the most (2,000–8,000), pushes MOQ to 3,000, adds 30 days, and your customer nev[……]
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“15-day lead time” in a Chinese quotation almost always means production time, not delivery time. It excludes component procurement. If your design us[……]
Lead-time accuracy beats lead-time speed. A supplier promising 15 days with ±2 days variance is worth more than one promising 10 days with ±10 days va[……]
Factory size is the least useful thing you will be shown. A 12,000 m² plant with eight SMT lines tells you about capacity, not about quality. The two[……]
A 200W IP67 waterproof LED power supply does not deliver 200 W in a sign cabinet in July. It delivers about 140 W once the air around it reaches 60°C,[……]
“Rainproof” is not a standard — it is a trade term that maps to IP65. When a buyer asks for a “rainproof power supply,” they almost always need IEC 60[……]
