Have I got this right, the TC-420 is only 30 bucks?
TC420 1.4" LED Programmable Time Controller - Black (12~24V) - Free Shipping - DealExtreme
The plan so far is this: For my existing light bar with 30x 6500k, add three RGB channels. There will be six RGB combined "1W" LEDs, each channel will have six leds. LEDs organized in parallel/series array to meet 1000mA.
There will be three LDD-L drivers powered by one 65W/24V supply. It is enough to cover the needs of all three channels on full.
The analog dimming strategy involves reducing 24V down to 2.5V then using a voltage divider (pot) to select in the range of 0-2.5V. Each channel will require a voltage regulator, some caps and resistors, and a pot (value and form factor tbd
.) Estimated $3-5 per channel. The advantage of this method is that everything is self contained, there will be three independent pots to control R, G, and B. Very easy to use.
The PWM strategy.. depends on the capabilities of the typhoon.
* How many channels can it control? I need six channels.
* How easy is it to adjust RGB? It looks like it would be a PITA, nowhere near as easy as three pots.
The idea is that I can add whatever mix of White/Full Spectrum/etc leds to the main channel (which has three settings) and then use the RGB to create the perfect viewing experience. This way I don't have to keep physically swapping color leds.
The analog solution can be done for $35-40 per side.