I have been using these lamps for decades. Don't be fooled, there is a big difference between "no-name" onions and Sylvania onions. These are industrial lights - I've had many unnamed bulbs that fell apart before I even took them out of the box. Spend a few euros more and be happy.
π‘ GoodBulb LU70/MED - 70W E26 High Pressure Sodium HID Bulb, 2000K Warm White - 2 Pack
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