Our local drive-in (less than two miles from my work) just installed brand new digital projectors, and boy do they look amazing. For the longest time I avoided seeing movies with high budget special effects at the drive-in because of their ancient projectors, but now I don't have to skimp on the trips to the Starlite at all this summer. I had no complaints with the quality of PotC and Spiderman 3. If only they hadn't removed the playground equipment from in front of the screens . . .
Your drivein installed video projectors? Well that set 'em back at least $100,000 each. The video projection still doesn't even have standards in place to ensure compaibility. Video projection is still considered experimental in theaters. Here's what the hidden costs/problems are with video:
Projectors are very expensive.
Projectors have to be thrown away every 5 years.
In order to meet the same brightness levels as a film projector xenon lamp wattage MUST be doubled. If the film projector used a 4,500 watt lamp then the video projector must use use a 10,000 watt lamp (very very expensive and only has a 500 hour life). This requires increasing lamphouse & bulb cooling requirements (expensive). These sizes of bulbs also need tremendously more electricity. Three phase power is an absolute necessity (not always available at every drive-in).
It has yet to be proven that these video projectors can stand up to the dusty environments of drive-ins. The ones I've seen installed in indoor theaters have been in "clean room" environments (not exactly the real world). Don't forget that driveins don't exactly have 'clean' AC power all the time. Power spikes, surges, and brownouts are common at many driveins.
Many driveins are mom n pop operations so these expensive video projectors would break the bank (and the budget). Ticket prices and food prices would have to be raised quite a bit to pay for a video projector. Driveins are known for having lower prices and bringing in large families. Having to raise prices would drive away that business. Even a 60 year old Super Simplex film projector with some common maintenance can blow the socks off a video projector any day and not break the bank. Plus the fact that parts are still manufactured for film projectors dating back to 1928!
I think your drivein should have invested in a brand new xenon lamphouse and power supply (about $10,000) instead of throwing money away on video projectors.