I was just thinking about cab lights last night while removing the remnants of the 3 on my 6400.
Already have numerous replacements and hadn't decided on 3 or 5... took a look through the gallery just now and of the trucks that have them 3 is more common than 5, and to my taste the trucks with 3 look much better than those with 5.

Looks like I'll be using 3 again.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-