Have a 4-40 volt battery and need to run 6 or 3 volt lights or other functions? Here is the perfect solution. Easily wire in 4-40 volts, dial down the easy-to-read digital meter to whatever voltage you require and hook up the auxiliary function to the output. Simple as that.
Not for use with motors or high current hardware. For larger current draw applications use the Harbor Models' Power Distribution Panel.

Step-Down DC voltage regulator.
Input: 4-40V.
Output: 1.25-37V adjustable, 1.5A continuous current.
3A max.
Digital voltmeter.
Two 2-position screw terminals for easy wire insertion.
Dimensions:
2.6" x 1.4" x 0.5"
Mounting holes.

Download/View Instructions

10mm - OUT OF STOCK

Dispersion: 180°
Back is round, not flat
1/Pack
Please choose your diameter from the drop down menu.

These do not include bulbs but can be fitted with a clear bulb found here: RO10

Here are the dimensions for the two available sizes, the "r" dimension is the bulb insert through the base of the fixture.

5mm Dimensions: R=3/16" (5mm) H=9/32" (7mm) r=1/8" (3.3mm)

7mm Dimensions: R=9/32" (7mm) H=11/32" (9mm) r=3/16" (4.5mm)

10mm Dimensions: R=3/8" (10mm) H=15/32" (12mm) r=1/4" (6mm)

Dispersion: 180°
Back is round, not flat
1/Pack
Please choose your diameter from the drop down menu.

The 4mm size does come with a red LED that can be powered with 6-12 volts.
Includes resistor for scale luminosity in 12 volt systems (to install the resistor, solder it into the positive side of the light as shown here). The other sizes do not include bulbs but can be fitted with a clear bulb found here: RO10

Here are the dimensions for the available sizes, the "r" dimension is the bulb insert through the base of the fixture.

4mm Size: R=5/32" (4mm) H=7/32" (5.7mm)

5mm Size: R=3/16" (5mm) H=9/32" (7mm) r=1/8" (3.3mm)

7mm Size: R=9/32" (7mm) H=11/32" (9mm) r=3/16" (4.5mm)

10mm Size: R=3/8" (10mm) H=15/32" (12mm) r=1/4" (6mm)

Dispersion: 180°
Back is round, not flat
1/Pack
Please choose your diameter from the drop down menu.

The 4mm size does come with a green LED that can be powered with 6-12 volts.
Includes resistor for scale luminosity in 12 volt systems (to install the resistor, solder it into the positive side of the light as shown here) . The other sizes do not include bulbs but can be fitted with a clear bulb found here: RO10

Here are the dimensions for the available sizes, the "r" dimension is the bulb insert through the base of the fixture.

4mm Size: R=5/32" (4mm) H=7/32" (5.7mm)

5mm Size: R=3/16" (5mm) H=9/32" (7mm) r=1/8" (3.3mm)

7mm Size: R=9/32" (7mm) H=11/32" (9mm) r=3/16" (4.5mm)

Dispersion: 360°
Bulb NOT included.
1/Pack

Can be converted to a working lamp.
Bottom open to accept a bulb. Bulb found here: RO10

Here are the dimensions for the available sizes:

6mm Dimensions: R=1/4" (6mm) H=7/16" (11.5mm)

12mm Dimensions: R=15/32" (12mm) H=23/32" (18.5mm)

Dispersion: 360°
Bulb NOT included.
1/Pack

Can be converted to a working lamp.
Bottom open to accept a bulb. Bulb found here: RO10

Here are the dimensions for the available sizes:

5mm Dimensions: R=3/16" (5mm) H=5/16" (8mm)

8mm Dimensions: R=5/16" (8mm) H=9/16" (14.5mm)

10mm Dimensions: R=3/8" (10mm) H=5/8" (16.5mm)

Dispersion: 360°
Bulb NOT included.
1/Pack

Can be converted to a working lamp.
Bottom open to accept a bulb. Bulb found here: RO10

Here are the dimensions for the available sizes:

5mm Dimensions: R=3/16" (5mm) H=5/16" (8mm)

8mm Dimensions: R=5/16" (8mm) H=9/16" (14.5mm)

10mm Dimensions: R=3/8" (10mm) H=5/8" (16.5mm)

Comes with clear bulb.
Nickel finish
1/Pack
3V
Dimensions:
Diameter: 1/2" (12mm)
Height: 5/16" (8mm)

Provided in silver colored plasic
Provided with clear 6 volt bulbs
2/Pack

Diameter of lens: 7/16" (10.5mm)
Height (not including mounting post): 9/16" (15mm)

Provided in silver colored plasic
Provided with clear 6 volt bulb
1/Pack

Diameter of lens: 9/16" (15mm)
Height (not including mounting post): 1" (24mm)

Provided in silver plastic
6 volt bulb included
1/Pack

Diameter of lens: 13/16" (20mm)
Height: 1 1/32" (28mm)
Width: 1" (25mm)

2 super bright 2800 candle power bulbs with 5/8" diameter focused aluminum reflectors
Uses 9 volt battery (not included)
employs a servo momentary switch to control on/off remotely
great for spot lights or floodlights
2 lights per pack (both controlled by the same switch)

2 super bright 2800 candle power bulbs with 5/8" diameter focused aluminum reflectors
Uses 9 volt battery (not included)
to be wired straight to a manual switch or relay for remote on/off (does not come with a switch of any kind)
great for spot lights or floodlights
2 lights per pack

White plastic
Bulb not included
Can be converted into a working searchlight
Available Sizes:

Diameter: 7/8" (22mm) Height w/ mount: 1-7/8" (48mm) Depth: 15/16" (24mm)

Diameter: 1-3/16" (30mm) Height w/ mount: 1-3/8" (34mm) Depth: 5/8" (16mm)

Uses the following bulb to make a working searchlight, specify "Clear": RO10

Nickel metal finish
3V bulb included
1/Pack

Dimensions:
Diameter: 1/2" (12mm)
Height: 11/16" (18mm) (this dimension does not include mounting post)

Nickel metal finish
3V bulb included
1/Pack

Dimensions:
Diameter: 9/16"
Height: 13/16" (this dimension does not include mounting post)

Plastic Searchlight with brass post and lens

Dimensions:
Diameter: 9/16" (14.5mm)
Height: 1-1/4"
Does not include bulb

Uses the following bulb to make a working searchlight, specify "Clear": RO10

Brass metal arm with an aluminum fixture
6 volt bulb included
2/Pack

Dimensions:
Length of arm: 1 5/8" (41mm)
Diameter of fixture: 3/8" (9mm)

Lamp Set of Side Lights
Provided in white plastic with clear lens
Suitable for a flat wall for 180 degree light dispersion
2 sets/Pack

Dimensions:
Height: 13/16" (20mm)
Width (from the front): 3/8" (10mm)

Lamp Set of Side Lights
Provided in white plastic with clear lens
Suitable for a 90 degree corner
2 sets/Pack

Dimensions:
Height: 13/16" (20.5mm)
Width (from the front): 1/2" (13mm)

Housing made of transparent plastic, unpainted, can also be cut to a simple lamp.
6 volt bulb provided
2 sets/Pack

Diameter: 3/16" (5.4mm)
Height: 1/2" (12mm)

Housing made of transparent plastic, unpainted, can also be cut to a simple lamp
6 volt bulb provided
2 sets/Pack

Diameter: 3/16" (5.4mm)
Height: 1/2" (12mm)

Paintable plastic with lens
2/Pack
Bulbs not included

Dimensions: Width: 1/2" (13.5mm) Height: 3/8" Height w/ mounting post: 7/16"

Dimensions: Width: 13/16" (20mm) Height: 5/8" (light only) Height w/ mounting post: 13/16"

Uses the following bulb to make a working light, specify "Clear":
RO10

Nickel finish
6 or 3 Volt depending on size, check the specs listed for each size for voltage provided
1 Pair/Pack
One green, one red bulb included in each pack

Size: 9/16" - 15mm Specifications: 6 Volt Width: 19/32" (15mm) Height: 5/16" (8mm) Depth: 1/4" (6.7mm)

Size: 13/16" - 20mm Specifications: 3 Volt Width: 13/16" (20mm) Height: 5/16" (8mm) Depth: 1/4" (6.7mm)

Size: 1" - 25mm Specifications: 3 Volt Width: 31/32" (25mm) Height: 3/8" (9mm) Depth: 9/32" (7.2mm)

Size: 1 3/16" - 30mm Specifications: 6 Volt Width: 1 3/16" (25mm) Height: 3/8" (9mm) Depth: 5/16" (8.2mm)

Size: 1 3/8" - 35mm Specifications: 6 Volt Width: 1-3/8" (35mm) Height: 19/32" (15mm) Depth: 3/8" (9.5mm)

Provided with colored lens of your choice and one bulb.

Bulb is 6v
Height: 3/4" (19mm)
Diameter: 3/8" (8.8mm)

CLEAR and YELLOW IN 3V NOT AVAILABLE

High-quality mini bulbs. Filament support withstands shocks. Suitable for all types of models.
These fit in all lights found on this website.


6 Volt Option:
Life span: ~ 5,000 hours at nominal voltage
Diameter: 0.12" (3mm)
Voltage: 6V
Cable Length: 32" (extra long leads make wiring to a power source very easy) ***NOTE: YELLOW BULBS HAVE A 5" LEAD***
1/Pack

3 Volt Option:
Life span: ~ 5,000 hours at nominal voltage
Diameter: 0.12" (3mm)
Voltage: 3V
Cable Length: 8"
1/Pack

Wires from that light not making it to the battery? This 32 gauge wire will get you the rest of the way. Works well with 3, 5 and 6 volt lights.
Wire provided in white insulation.
This is now provided in double strand 16.5 foot lengths per quantity ordered.