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28 people found this helpful
Yes they are large, yes they are bright!
on April 30, 2012
I picked up a set of these for my Linco Flora light and they arrived today. I hooked them up and did some test photos. Per the light meter in my camera (Sony a57), it reads about 6000K with 3 bare bulbs in a silver umbrella off of a whitecard, so a little cooler than the quoted 5500K. (For the record I tested some other "5500K" labeled bulbs and they also measured 6000-6100K, so it could be my camera itself)
As others have commented, these bulbs are rather large, so won't fit in most household fixtures that have any sort of harps or containers. If you're buying these for photographic use (their intended purpose), I think you will find them to be an affordable way to put a lot of light on your subjects. Given that they are coiled spirals and not spot lights, they really need some sort of umbrella or other cowling to redirect the lateral light forward.
They do put out a bit of heat after they have warmed up, so I would not leave them on more than necessary in an enclosed softbox. I let them cool off for about 5 minutes before putting them back in their styrofoam holders. Be sure to grip them by the base not the glass when inserting or removing them.
I will post a followup sometime after I've been able to use them in an actual shoot and see what the final images look like.