This NEMA head I think dayburns now but I wasn't able to get a photo yet. So I got it off Google.
|Lamp Type:||Mercury Vapor|
|Photocell Type:||Twist Lock|
|Download:||Download this File|
|File Size:||268 KB|
|Date added:||Feb 08, 2019|
|Dimensions:||741 x 493 pixels|
|Favorites:||Add to Favorites|
Vintage HID Lamp & Luminaire Collector
Your mission - should you choose to except it - is to save unique and rare HID lighting before it's all scrapped.