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Yike's much cheaper....Thanks...I'll keep that in mind.

The wavelength is 400-405nm, and yep, they are the 5mm type. I was thinking of having a bank of 10. At $1.50 each, I'll give it a go, and experiment to see if it works, and post back here on the results (probably in a month or so's time) The UV LEDs in the Unifilter 500 is only 2x5mm so going by that, that too is a waste of time, glad I didn't spend $100 on one, $20 is much better to waste, and more fun doing it yourself.

Hi, I've been looking at UV sterlizers and I saw a Unifilter 500, and it uses UV LEDs, which being technically minded, I thought, "I can do that", and have sourced some UV LEDs (wavelength 400->450nm) for next to nothing each. But I've seen a comment somewhere (can't remember where) that the UV prodcued by a LED isnt suitable for this application (so what does the Unifilter do?). Can anyone confirm or deny the suitability of UV LEDs for aquarium use. Or has anyone had any experiance with the Unifilter products?

Has anyone here tried making their own LED lighting system? Cheers

The system is based on an AVR (www.atmel.com) 8 bit micro processor, the solenoids (water and Co2) have been canabalised from washing machines and an incubator (but they can be bought from various places around as components). The user interface is currently a 80x8 character LCD display, and the front panel from the incubator. The temperature sensors are 10 bit 1wire sensors, and the light levels are sensed using a LDR. I'm going to be using it for a freshwater system. At the moment, there are no plans to add internet connectivity to it (but it's not impossible). Oh, I've also filled in where I am (the Wairarapa). Matthew

Hi, I'm in the middle of building a microprocessor based system that monitors temp, pH and light levels, and allows the control of heaters, Co2 solenoid, water changing solenoids, and two banks of lights. What other things do people think would make this more useful? Thanks for you input. Matthew