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just bought a solid state relay for my spotlights...jordan fitted it last night...wow does it ever make an improvment...Jcar sell them for $39 and it was money well spent...
Solid State Relay 3-32VDC Input 100A@30VDC Switching

Switching high current DC loads normally requires use of a contactor to avoid arcing as the contacts try to separate. This solid state relay uses MOSFET technology to provide an economical and reliable method of switching medium to high power DC loads. By electrical switching with a semiconductor, there is no arcing as contacts break at high current and the low on-state resistance provides a viable alternative to the bulky and expensive contactors we used to use.

Output Circuit
Load Voltage: 0-30VDC
Load Current: 0.02-100A
Max On-State Resistance: 0.007Ohms
Max On-State Voltage Drop: 0.35V
Max Turn On Time: 0.5ms
Max Turn Off Time: 0.5ms
Max Surge Current: 240A (10ms)

Input Circuit
Control Voltage: 3-32VDC
Control Current: 28mA max.
Min Turn Off Voltage: 1.0VDC
Input Resistance: 1.2kOhm

wish i had of gone this way ages ago...allows your light to work at 100% instead of about 80% with old relays

If you didnt wanna spend $40, you could buy the mosfet yourself and make one.

I bought an 8Amp mosfet for my electronic boost controller i made and it was $2.95

There is no way a mosfet is going to give you 20% brighter light than an equivalent relay!

seriously your old relay was stuffed if you reckon you are seeing a difference

it was stuffed but eather way i,m happy with the new one....thats all that matters..ok,maybe i,m wrong but for me it works and i like it....

Suparoo wrote:If you didnt wanna spend $40, you could buy the mosfet yourself and make one.

I bought an 8Amp mosfet for my electronic boost controller i made and it was $2.95

not so easy if its a high side switch, there more to it than just the mosfet.
but yeah, you can get them to have like .002ohm resistance at 50amp+, but not at $2.95. At that they are on par with relays - they do indeed have a contact resistance, that increases with wear etc.

We used to use them a lot in 240v applications but they used to have a savage leakage current whats it like for the 12v jobs?