The lens may very well be the problem, if the light is yellow you have an electrical problem that can be solved with a relay. I believe I found the conversion you have used;
Those kits are reflectors and bulbs only.
It maybe to late for this information but I will pass it along anyway. The following is a great simple conversion that will give you knock out headlights, the only down side for you as I see it, is no turn signals you will need to mount them separate. The bulbs a 7 in round, real glass cut lens, the brand speaks for itself.