Reviewed by 2 customers
does not fit securely on light holder, but is not much of a problem to fix.
These slip over (rather than screw into) the bulb socket assembly. But it does not fit snugly over the bulb socket. As a result the fluorescent tube is not centered in the reflector. I fixed it by hacksawing the socket end into four splines which are then squeezed against the socket by adding a hose clamp. Works great now. Reflectors quality relative to the price still makes the extra work worthwhile.