---
title: "Kevin Pan (@yoyouv) | Hashnode"
description: "UV LED Water Treatment/UV LED modules | Embedded Control | OEM/ODM. Read the latest articles by Kevin Pan on Hashnode."
url: "https://hashnode.com/@yoyouv"
---

@yoyouv

# Kevin Pan

@yoyouv · Shenzhen · Joined September 2026

UV LED Water Treatment/UV LED modules | Embedded Control | OEM/ODM

### [UV Intensity Sensor Calibration for Water Disinfection: A Field SOP Buyers Actually Use](https://yoyouv.hashnode.dev/uv-intensity-sensor-calibration-for-water-disinfection-a-field-sop-buyers-actually-use?utm_source=hashnode&utm_medium=feed)

UV Intensity Sensor Calibration for Water Disinfection: A Field SOP Buyers Actually Use Your UV reactor can look healthy on the HMI and still be off-spec. The dose algorithm only trusts what the inten

7 min read · [yoyouv.hashnode.dev](https://yoyouv.hashnode.dev/uv-intensity-sensor-calibration-for-water-disinfection-a-field-sop-buyers-actually-use?utm_source=hashnode&utm_medium=feed)

[Nov 4](https://hashnode.com/posts/uv-intensity-sensor-calibration-for-water-disinfection-a-field-sop-buyers-actually-use/6aeb6848fe54c4041ca7683c)

### [UV Reactor Hydraulic Design and Short-Circuiting: Why Average Residence Time Is Not Dose](https://yoyouv.hashnode.dev/uv-reactor-hydraulic-design-and-short-circuiting-why-average-residence-time-is-not-dose?utm_source=hashnode&utm_medium=feed)

Buyers often size a UV reactor from flow rate and a brochure “dose.” Then the first validation run shows uneven kill. The gap is usually hydraulics, not a weak lamp. Average residence time is a volume

7 min read · [yoyouv.hashnode.dev](https://yoyouv.hashnode.dev/uv-reactor-hydraulic-design-and-short-circuiting-why-average-residence-time-is-not-dose?utm_source=hashnode&utm_medium=feed)

[Nov 3](https://hashnode.com/posts/uv-reactor-hydraulic-design-and-short-circuiting-why-average-residence-time-is-not-dose/6aea14908b314abf5435a5f1)

### [Matching LED Power Supplies to Strip Lights: Voltage, Wattage, and Headroom](https://yoyouv.hashnode.dev/matching-led-power-supplies-to-strip-lights-voltage-wattage-and-headroom?utm_source=hashnode&utm_medium=feed)

An LED strip that flickers at the far end, runs hot at the supply, or fails early often points to a mismatched driver—not a “bad reel.” Wholesale buyers and electrical specifiers can avoid most of tho

5 min read · [yoyouv.hashnode.dev](https://yoyouv.hashnode.dev/matching-led-power-supplies-to-strip-lights-voltage-wattage-and-headroom?utm_source=hashnode&utm_medium=feed)

[Nov 1](https://hashnode.com/posts/matching-led-power-supplies-to-strip-lights-voltage-wattage-and-headroom/6ae6f746f3279f425b93f099)

### [LED Lighting Basics for Non-Engineers (Without the Jargon Overload)](https://yoyouv.hashnode.dev/led-lighting-basics-for-non-engineers-without-the-jargon-overload?utm_source=hashnode&utm_medium=feed)

If you manage a workshop, clinic, retail fit-out, or small warehouse, you have probably been sold “LED upgrades” that sounded simple and then arrived with datasheets full of CCT, CRI, and efficacy num

2 min read · [yoyouv.hashnode.dev](https://yoyouv.hashnode.dev/led-lighting-basics-for-non-engineers-without-the-jargon-overload?utm_source=hashnode&utm_medium=feed)

[Nov 1](https://hashnode.com/posts/led-lighting-basics-for-non-engineers-without-the-jargon-overload/6ae6bbdf1d58d8b8769f5cdf)

### [Designing a Fail-Safe ESP32 Controller for a Flow-Through UVC LED System](https://yoyouv.hashnode.dev/https-yoyo-uv-com-blog-esp32-uvc-led-controller?utm_source=hashnode&utm_medium=feed)

Learn how to design an ESP32-based UVC LED controller with flow sensing, temperature monitoring, safe GPIO interfacing, and fail-safe driver control.

7 min read · [yoyouv.hashnode.dev](https://yoyouv.hashnode.dev/https-yoyo-uv-com-blog-esp32-uvc-led-controller?utm_source=hashnode&utm_medium=feed)

[Sep 28](https://hashnode.com/posts/https-yoyo-uv-com-blog-esp32-uvc-led-controller/6ab9d58f05de28580a48e972)