Mine is around 20,000 gallons (deepest part is only 5 feet) with dimensions of 36'6" by 24' with 2 lights. Sounds like you have a big pool. Maybe you should get 3? Maybe that's overkill? If you are worried about it being too dark I would definetely get some builder's advice.

David...I have Ocean Blue PebbleSheen, the Sheen equivalent of Midnight Blue Pebble Tec. Yes, the adjacent trees on/near our property do reflect off the surface of the water, making parts look green at different times in the day. And, it's not just the trees, it's also the shrubs and low plantings we have - all at least 5' away from the water's edge. The only way I can see to getting around the green reflections is to surround your pool with concrete for quite some distance! I suspect, as you do, that the reflection of green will happen no matter what pool finish you choose...however it would be intensified if you choose a finish/color that has a green look to it already. Because you have a heavily wooded backyard, your pool color, even with green reflections would probably look better in your environment than a bright blue finish with no reflections (if that were even possible). As far as lights are concerned, we have 2 SAm lights in a 40' pool, depth 3-6', and we can see the bottom just fine with all colors, although some are more illuminating than others.

Not exactly. The color red has a shorter "reach" than the other colors. Someone should come along to give you a more technical explanation, but if the LED's are only showing red, it'll surely be darker than the other colors, and very well won't fill the pool with color. Our SAVI LED's red color is called "Magenta", and is actually a mixture of red and blue... which gets some more color into the pool, but is definitely the darkest of the five colors it circles through.

Here is my pool with LED "disco" lights. Two lights, one on each end, plus a spa light. The locations are very close the ends of my diagonal swim lane, which makes lap swimming at night okay, on the darker light settings. White would be too bright to swim towards both ways. I believe these pictures were taken with the light blue; there is also a deep dark blue that I love for a more subtle light. Or maybe this is white and the color I like is blue. I don't have a manual for the lights so it's kind of a crap shoot what color I get when I turn the switch on. We don't use the lights often enough for me to remember how to program it, even though we use the pool almost every night if we're not in a thunderstorm. The only thing I don't like is that when we moved the spa to it's current location, I didn't think to move the light, so it shines straight into the house. It's not awful, but it would have been nicer to have it anywhere else, because the pool is below my house (pool deck is 4" down from lanai, which is 4" down from living room). If the link doesn't work, google "New Blue Pool" and go to May 19th, 2011 "Night Lights". The "Pool Details" page has the diagram if you want specifics, but you can get the idea if you know that the diagonal swim lane is about 36' long. Here is a link that might be useful: New Blue Pool