1. I can't speak to the future production of rear projection televisions. I honestly don't know for sure what we have planned for next year and I just can't speak to what I do know. I will say that the market for RPTVs are declining, as that's not a company secret, but an industry known measurable variable. However, we're still introducting new technology in the units we make, and the price point for those units are very popular, and the picture is solid. We will be continuing support for the units, as well as parts, to the best of my knowledge if we were to stop producing those units.
That said, DLP is the fastest technology available today, offers a potential limitless gaming experience with 3-D ability, and is the only technology that suffers 0% possibility of burn-in or screen retention. Samsung was the first to market with DLP, and we've been consistently a leader in DLP Technology.
2. The main difference is that the A650 Series has a mercury-based lamp engine, and the A750 has an LED based lamp engine. The A650 series lamps are easily replacable by you, and will last about 6000 hours before half-life (3-5 years, very high usage to low usage). The A750 will last about 30,000 hours half-life (half-life means half of the brightness from day 1), but requires a service call to replace the LED lamp engine. I'll list out the two spec sheets here for your review, and if you have any questions, I'll be happy to answer them.
3. The picture quality is comparable, but from two different technologies. The best determination is what you think looks better.
4. The cost of lamps:
61A750: Not listed, as it is a service-only part.
Your rear projection TV's come highly rated, but I have several questions:
1. Is Samsung continuing its line of RPTV's or will you stop production?
2. What is the difference(s) between your HL61A750 and the HL50(56)A650 (other than screen size)?
3. Can I expect the same picture quality from the HL50(56)A650 as the HL61A750?
4. What type of bulb/lamp is used in the HL50(56)A650? How long should the lamp last, and what is the cost of a replacement?