T-10 lamps. I bought them to fit into some of the DRL sockets on the aftermarket headlights I bought. These bulbs are no brighter than the ones currently in use, but the main difference is that these bulbs emit most of the light at right angles to the bulb and not straight up like I was hoping. Your install was actually a downgrade so I'll be returning it. I bet they would be a good replacement for applications where the light needs to come from the side of the lamp, replacing incandescent bulbs, but they are not what I need. I've posted photos to compare with Syl 2825 bulbs (those bulbs are on the left, Syl 2825 in the middle and unknown on the right) and you can clearly see that the Syl bulb has a large brightness advantage right off the top of the bulb.
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