{"product_id":"advance-transformer-co-li551h4-lamp-ignitor-li551h4","title":"Advance Transformer Co. LI551H4 Lamp Ignitor LI551H4","description":"\u003cdiv\u003e\u003cp\u003eLI551H4 is a round, black ballast ignitor from Philips Advance designed for 35–150 W high‑pressure sodium lamps and to be used with compatible core‑and‑coil HID ballasts. The compact round housing measures about 1-1\/4 inches in diameter and 2-1\/2 inches in length, and it operates on 120–277 VAC to deliver the ignition pulse required to strike the lamp. The ignitor supports a lamp‑to‑ignitor distance of up to 2 feet, guiding fixture layout where the lamp is within reach of the ballast. It is specified for HID systems using 35–150 W HPS lamps, and its round‑case design is part of the LI551H4 family of ignition components from Advance Ballast. Used with a compatible ballast, this LI551H4 provides the ignition energy needed to reliably start high‑pressure sodium lighting in round‑case configurations.\u003c\/p\u003e\u003c\/div\u003e","brand":"Advance","offers":[{"title":"New","offer_id":51657029583150,"sku":null,"price":65.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_6b48c6e5-73dc-4721-9b0c-83f6223cf8e6.jpg?v=1769465355","url":"https:\/\/plgautomation.com\/products\/advance-transformer-co-li551h4-lamp-ignitor-li551h4","provider":"PLG Automation ","version":"1.0","type":"link"}