Bunker Hill Security 120 Lumen Solar Motion Security Light Review & Modification


  • Brand: Bunker Hill Security
  • Model: 120 Lumen Solar Motion Security Light
  • LEDs: 20 SMD LED array
  • Battery: 3.2v, 600mAh Lithium Ion
  • Circuit board part number: DG606a
  • Bright Mode: 120 Lumens (motion detected)
  • Bright Mode Duration: 1 Minute +/-
  • Dim Mode: 6 Lumens (always-on after dark)

I picked up these 120 Lumen Solar Motion Security Lights from Harbor Fright on sale for $12.

Bunker Hill Security > 120 Lumen Solar Motion Security Light


120 Lumens is plenty bright to light up my back deck, and some of the surrounding area. Aiming the unit down at about 45 degrees from just above the door lights the door very well and out into the yard.

Motion Sensor

The motion sensor works well. I have the light mounted above the door, aiming down at about 45 degrees. The sensor picks up my motion as I approach, probably from 15-20 feet out.

Solar Charging

My back door faces West. With the sun setting in the Southwest this time of year (Winter) the unit in this location only gets 4 hours max of sun light. And some of the time trees block the sun. This is not enough charging time for the unit to support the always-on after dark low-light mode. The battery appears to be completely dead after a few hours.

Always-On After Dark

This unit has a Always-On After Dark low-light feature. I think the low-light mode is around 6 lumens. This Always-On after dark feature is not mentioned on the packaging anywhere, and I find it super annoying. I do not need or want the light to stay on all night. Event if it is just a dim light. For me the light would be perfect if it did not have the feature. So I went on a hunt to try to modify the light.

I want to preserve the battery for what is important, to light up the door, the deck, and the stairs as family members come and go.

Modifying the Circuit Board

With help from members of the All About Circuits forum, we’ve discovered a way to disable the Always-On After Dark mode by modifying the circuit board. I un-soldered the connection between Q2 and L+ (shown below) and now the light stays off after dark, and the motion sensor still works perfectly.

Q2 is a surface-mount Transistor (M6). It has 2 leads on one side, and one lead on the other. I un-soldered the lead, on the side with only one lead. Cutting the lead and insulating it from from the board should work as well.

Testing The Modification

I’ve tested the DG606a circuit board modification in a real world setting for 10 days now. Motion tigers the light as it should. The sensor still detects motion 15-20 feet away. The light comes on in full bright mode (120 lumens). The low-light (6 lumens?) Always-On After Dark mode does not come on at all. The light stays off until someone approaches. Even with several back-to-back grey and rainy days the battery is maintaining enough charge to operate several times a night.

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Kimball is a website designer and developer in Goffstown, NH.

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