Light sensing switches can be used for lighting, motors, actuators, solar systems, marine (anchor light) and other applications. Use this handy comparison table of specifications to compare features and specifications to suit your particular requirements.

The SPLS-12-30W light sensing switch is a low cost, adjustable device that can operate as low as 5v DC, perfect if you have another circuit operating at 5 volts. It can also go as high as 18 volts, which makes it a good choice for solar systems. The adjustable light threshold trigger gives you very precise control of the activation conditions. It has a maximum power output of 30 watts (2.5 amp @ 12v), but you can use an external relay to handle heavier loads. See instructions for adjusting light threshold here.

The SPLS-12-120W light sensing switch is a waterproof, high capacity unit with low battery protection and a very low standby current spec, perfect for use with a boat anchor light and other marine applications. It has a maximum power output of 120 watts (10 amp @ 12v), but you can use an external relay to handle heavier loads.

Light sensing switches can be purchased in our online store, click here to view in a new window

We hope the following information and specifications will help you make the right choice when selecting a light sensor switch, but please feel free to contact us at any time if you have any questions.

Light Sensing Switch Comparison Table:

Part Number	Nominal Voltage Volts DC	Input Range Volts DC	Off/On Current mA	Water- proof	Adjustable Threshold	Status Light	Reverse Polarity/ Shorted Output Protection	Low Battery Protection
SPLS-12-30W	12	5 to 18	3.5/2.8	No	Yes	Yes	Yes/No	No
SPLS-12-120W	12	10 to16	0.15/16	Yes	by placement only	Yes	Yes/Yes*	Yes

*a relay switches the output, thus it can withstand temporary short conditions (your power supply may not).
The input and output circuits should always be fused for safety reasons, regardless of the device.

If you want to reverse the operation of these switches, you can use an external relay with normally closed contacts connected to your operating device. When the switch is off, the output of the relay will be on, thus activating whatever is connected. You may have a situation such as fan, where you need to have it operating during daylight hours and switched off at night. Note that you would need to run a separate power line to operate your device in this case.

If you want to operate heavy loads that exceed the capacity of the switch, you can also use an external relay for this purpose.

We sincerely hope you enjoy using these advanced light sensing switches; if you have any questions, please feel free to contact us at any time!