{"product_id":"advance-transformer-co-li551h4-lamp-ignitor","title":"Advance Transformer Co. LI551H4 Lamp Ignitor","description":"\u003cdiv\u003e\u003cp\u003eThe Advance Transformer Co. LI551H4 lamp ignitor is a round‑case ignition device for high‑pressure sodium (HPS) lighting, designed to start a single 35 to 150 W lamp in HID ballast circuits. Implemented with a compatible core‑and‑coil ballast, it delivers the energy pulse required to strike the arc and light the lamp reliably. The ignitor operates on 120–277 VAC and is specified for a maximum distance of 2 ft from the lamp, helping ensure proper ignition under typical installation conditions. In its compact package, the unit measures about 1-1\/4 in diameter and 2-1\/2 in long, finished in black, and is commonly cataloged as LI551H4IC or LI551‑H4 in Philips Advance ballast literature for round‑case igniters. This part is intended for 35–150 W HPS installations and is used as a replacement in fixtures using Advance\/Philips HID ballast systems that require a single‑lamp ignitor within that wattage range.\u003c\/p\u003e\u003c\/div\u003e","brand":"Advance","offers":[{"title":"New","offer_id":51657029615918,"sku":null,"price":29.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_4748807c-c09f-4581-998c-2b0139cdc254.jpg?v=1769465356","url":"https:\/\/plgautomation.com\/products\/advance-transformer-co-li551h4-lamp-ignitor","provider":"PLG Automation ","version":"1.0","type":"link"}