The Smith-Victor ECT (500W/120V) Lamp (Pack of 6) are PS25/5 shaped photoflood bulbs with an approximate lifespan of 60 hours.They are for Smith-Victor Adapta-Lights, Thrifties, Ultra Cools, DigiLight brand of continuous lighting and PL lights
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My local lighting store did not have Eiko ECT 500 watt bulbs in stock, so I went online to find comparable ones. These are Osram bulbs. They do not have the longevity of the Eiko brand. Fortunately, this is a six-pack, so every time a bulb blew, I had an instant replacement.
These lights are great for about an hour, but they burn out entirely too fast. I will not be purchasing these again. :(