Looks like you need an adapter, but they can be fit to presta valves. I think there's more than one brand of valve stem light too.
We (the group of us testing night time equipment) figured that a little tiny LED like that wouldn't be very visible so we were all very surprised at how eye catching it really was. Over all lots of reflecting materials seemed to be the best way to go. LED blinkies no matter how bright were no where near as effective. Some things that really stood out: reflective piping on jackets- go figure.., reflectors on places that move - someone had a bunch of tape around the bottoms of their shoes- really visible.
Really, I probably wouldn't keep the standard old fashioned wheel reflectors. The old ones have been far surpassed in reflective technology and the new ones are made to be thrown away...... The reflective side walls that the OP already has on are already far better.



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