Just to close the loop on my portion of the thread, I didn't drill any additional holes and left the light on for about about 90 mins to see what would happen. At an ambient temp of 68, the lens was 75, and the hottest part of the housing inside the enclosure was 93.. This was measured with a heat gun and the whelen body must've acted like a heat sink because it wasn't even warm to the touch. Overall, for the ease of retrofit and the initial low cost, it was a solid purchase. Unfortunately, the price jumped again and at last check it was $20 (started at $13).