I wanted to 'future proof' (and also the kits weren't on sale) so I bought components:
16 Royal Blue XP-E, 8 Neutral White XP-G, 2 Blue XP-E LEDs
4 Royal Blue Moonlight LEDS and driver
3 Meanwell ELN-60-48P dimmable drivers (One for white, 2 for RB/B)
5.9" x 16" heatsink (not drilled or tapped)
Thermal adhesive, wire, power cords.
I will be using a separate fan controller and 80 mm fan above the heatsink and a Typhon controller.
From a quick measurement of the splash shield inside the BC29's hood, it looks like the heatsink should fit but minor modification may be necessary.
From what I have read on the lighting forum, the 2 RB: 1 NW should look like what I want and the 2 B will bring out some other colours.
The white and blue will be on separate drivers allowing fine tuning of colour and intensity.
The LEDs will be close to the water's surface and so optics aren't needed.
I know that spacing of the LEDs can result in spotlighting and/or a disco ball effect if not done properly. I also want to space the LEDs out to get good coverage over the whole area of the tank.
I know I should alternate colours as much as possible to get good colour blending and I have seen that typical LED spacing is 2 - 3".
As the heatsink is large, there is a lot of real estate to play with and several potential LED layouts that I am considering:
1) 3 rows of 8 LEDs. Rows 2.5" apart, LEDs approx 2" apart (2 blue LEDS 1/3 and 2/3 across the length of the heatsink)
2) 4 rows (7, 6, 7, 6 LEDs). Rows 1.5" apart, LEDs approx 2" apart (inlcudes blues in main pattern)
3) As number 1) but rows 2" apart
4) Group 2 RB and 1 NW together to form a cluster. Have a row of 3 clusters, a row of 2 clusters and a row of 3 clusters. To 'fill' the heatsink will require clusters to be spaced 5" apart and rows 2" apart. I know 5" is too much for individual LEDs but will it work for groups?
Is it more important to maintain the 2" between LEDs and 3" between rows or to spread out the LEDs to get better coverage in the tank?
I would appreciate any comments or alternative suggestions.
Edited to add layout 4 and other comments
Edited by GTi, 27 November 2011 - 06:55 AM.