I run 250 watt landing light bulbs in my "H" Model and also warped a couple of sets of landing light covers. I like to run with my landing lights on, but didn't want to lower the wattage and compromise the ability to light up the runway when landing.
To cure the issue and get a bunch of years out of the bulbs (and lenses) I had a Pulselight system installed. Problem solved. My landing lights stay on at all times except when solid IFR. The bulbs last for years, and the lenses remain happy.