User blog comment:Oioiaussie/Buy playgrounds? A common misconception!/@comment-5270134-20120720050233/@comment-5039776-20120720110834

You are right, you must understand cycles per day. You can usually pick up 3 x 8 hours per day, but not 4 x 6 regularly. A 4 hour decoration can usualy be picked up 5 times (say 7 am through 11 pm +/-). A 5 hour one 4 times.

All my calcs uses cycles per day (we don't on this wiki in terms of returns per day).

This is what I have for those decos above - not too different to you:

Bright Street Lamp - 1500 per pixel per day (6 x 3 hour cycles)

Firefly Lamp 4 - 1500 (1 only available - 5 x 4 hour cycles)

Firefly Lamp 1 - 1250 (5 x 4 hour cycles)

Round Street Lamp - 1200 (6 x 3 hour cycles)

Simple Street Lamp - 900 (6 x 3 hour cycles)

Giant Emerald - 750 (9 x 2 hour cycles)

Venus Fly Tap - 600 (3 x 8 hour cycles)

Giant Ruby - 600 (9 x 2 hour cycles)

Giant Sapphire - 450 (9 x 2 hour cycles)

Totem - 367 (3 x 8 hour cycles)