Gp20Na Compact PLC Controller: Advanced Industrial Automation Solution
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What is the GP20Na?
The GP20Na is a GP20Na-1 high-pressure sodium (Na) discharge lamp — a tubular HID lamp with an E40 Edison-screw base, boxed three to this record — not a PLC controller as the listing title suggests. The construction is the classic sodium lamp build: a clear tubular outer bulb, a polycrystalline alumina arc tube inside carrying the sodium charge (its amber getter coating is visible through the glass), a wire support frame holding the arc tube, and a nickel-plated E40 base at the bottom. Each lamp ships in its own plain carton labelled GP20Na-1. The lot is three lamps, new, intake recorded 29 October 2025, record weight 1 kg. Six photos and an inspection video show the lamps from the arc tube to the base.
Part details
| Field | Value |
|---|---|
| Type | High-pressure sodium (Na) discharge lamp, tubular (T) format, model GP20Na-1 |
| Base | E40 Edison screw, nickel-plated brass |
| Construction | Clear tubular outer bulb; PCA arc tube with amber getter; wire support frame; internal starting component visible beside the arc tube |
| Operation | Requires a compatible ballast (and ignitor where the fitting demands it) — HID lamp, not a direct line-voltage bulb |
| Packaging | Plain cartons marked GP20Na-1, one lamp each |
| Condition | New, 3 lamps; intake 2025-10-29, record weight 1 kg |
Values are read from the photographed construction and the box label; electrical ratings follow the lamp's own datasheet, as the carton carries no rating print.
Where this lamp belongs
Sodium lamps live where lumens per watt matter more than colour rendering — yard lighting, warehouse aisles, greenhouse supplemental light, street fittings. The tubular format with the E40 base drops into the standard lantern gear, and the amber getter on the arc tube is the sign of a properly processed lamp: the getter has already soaked up the impurities that would otherwise shorten arc life. The wire frame keeps the arc tube centred in the outer bulb so the thermal profile stays symmetric, and the internal starting component visible beside the arc assists ignition before the sodium vapour fully strikes.
The three lamps here are one type, boxed separately, glass unmarked and bases bright — clean stock for a fitting refresh. When a sodium installation starts cycling (lamp strikes, warms, extinguishes, repeats), the usual culprit is an ageing lamp past its voltage rise; swapping all lamps in a fitting bank at once, as this three-pack allows, keeps the remaining lamps from masking the diagnosis.
Photos and video
All images below are original KOEED warehouse photos. Click any photo to view it full size.
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