Agreed. My initial reason, as you, to go with Sunlight was to try and lower the electric bill. I ditched my 400W MH lights for the solar tubes and as you stated, the May Gray/June Gloom, dosen't give enough light on some days.
To keep with my energy effeciency plan, that was the reason for going with the PAR 38 LED's. They screw into a regular light socket, are fairly inexpensive, use little electricity, and last a long time.
I had a an issue with one and ecoexoitic was great in dealing with my problem. The color looks great with them. Even with a bright sunny day, I can still tell when the LED's come on. I think it's the best of both. I have the brightness and shimmer lines of the sun that look more natural like you see on a reef and I get the blue from the LED's that make the coral colors glow.
One thing I did notice was that when my Blonde Naso would swim into the bright sunlight and his fins were out, it seems as if someone "plugs" him in as his colors really stand out.
Hey Paul, good to hear from you. I'm doing a lot of travel for work right now but hope to get back to the tank work when I get back home. Got about 1 1/2 more months of traveling and then hope to be done so I can work on the tank.