Today I placed my order for an MBRP light bar and 5 lightforce 170's.
Tomorrow I'm heading to my local electronics shop to pick up my supplies to hook up all the wiring but I need some advice concerning relays and switches.
The LF 170's are 12v at 100w a piece so am I right saying that the amperage drawn is roughly 17 amps when using a set? What I'd like to do is wire up three of the lights of a single switch and relay and then have the other two connected to another switch and relay. This is my question;

1) Is it OK to wire up three lights off a single daystar switch which is rated at 20 amp? The switch would be wired to the ignition controlled power point to act as the trigger for the relay.

2) A 30 amp relay is sufficient to power three of these lights, right?

 

Nope.

Yep.

Three lights = 25A. So you need at least a 30A circuit.
#10awg from battery to relay ( 30A fuse ).
#14awg ( individualy ) from each lamp back to the relay.

Two lights < 17A
#12 awg from battery to relay ( 20A fuse ).
#14awg ( individualy ) from each lamp back to the relay.

One accessory circuit ( 3A fuse ) to power both switches.

 

Thanks for the clarity. I was just under the assumption that if I wired the daystar switch into the trigger wire of the relay (trigger wire would be the ignition controlled power point at lower console) that this part of the circuit wouldn't require anything higher than the 20 amp daystar switch seeing as how it's just a trigger. Then from the batt + to relay and relay to lights I would use the necessary 30 amp fuse & 10/14awg wiring. Am I wrong in thinking this?

 

The relay only pulls about 1/10 of an amp. Most products rate the trigger circuit @ 3 Amps. So a 20 A switch is way overkill. But if this is the switch you want to use. Then go ahead and use it. It will last forever on a relay trigger circuit.