Laser Module 405nm Violet Purple Blue Laser "Dot" Diode (Adjust Focus 5mw DC3V-5V)
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AI Verdict
A 5mW 405nm violet-blue laser diode with adjustable focus, built for basic maker and DIY projects requiring a low-power dot.
This laser module is a situational fit for maker_diy projects that specifically require a low-power, 405nm violet-blue dot with adjustable focus. Its 5mW output and duty cycle limitations mean it's not a general-purpose laser but rather suited for specific, intermittent signaling or alignment tasks. The brass and copper construction suggests a basic level of durability for its intended use.
If you need more power for marking or continuous operation, look for modules with higher mW ratings (e.g., 50mW+) and active cooling or longer duty cycles.
Regret Score™
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Critically weak dimension
Amazon rating vs actual quality
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Pros
- Operates on a wide voltage range from 3V to 5V DC, offering flexibility in power sources.
- Features an ACC circuit design, which helps maintain stable output power.
- Adjustable focus allows for a sharp dot at various working distances.
- Constructed with a brass cap and black copper tube for the housing.
- Compact size at 14.5mm (D) x 45mm (L) for integration into small projects.
- Low operating current of less than 50mA at 3V.
Cons
- Limited to a 10-minute duty cycle with a 1-2 second off period, not suitable for continuous operation.
- The 5mW power output is very low, limiting its application to non-cutting or non-engraving tasks.
- Beam effect is a 120-degree line, not a perfectly tight dot without adjustment.
- Operating temperature range is narrow (0-30 °C), which might be restrictive for some environments.
- No integrated mounting solution, requiring custom fabrication for installation.
Dimension Scores
The 405nm wavelength and adjustable focus allow for a defined dot, but the 120-degree beam effect suggests it's not a perfectly collimated beam without adjustment.
It's a simple two-wire connection for power and features a manual adjustable focus, making it straightforward for basic integration.
Its 5mW power and 10-minute duty cycle severely limit its applications to only low-power, intermittent dot projection tasks.
The brass and copper construction provides a basic level of physical robustness, but the narrow operating temperature range (0-30 °C) and duty cycle limit its long-term operational durability.
Best For
- Basic laser alignment in small-scale prototypes.
- Educational electronics projects demonstrating laser principles.
- DIY signaling or indicator lights where a violet-blue dot is needed.
- Hobbyist applications requiring a low-power, focusable light source.
Not Recommended For
- Laser engraving or cutting applications.
- Projects requiring continuous, long-duration operation.
- Outdoor use in varying temperature conditions.
- Applications needing a high-power or high-visibility laser.
Watch Out For
- The specified duty cycle of '10 minutes on and 1-2 seconds off' means it's not designed for constant use, risking premature failure if run continuously.
- At 5mW, the laser's visibility can be low in well-lit environments, making alignment difficult.
- Adjusting the focus requires manually turning the front cap, which can be fiddly and might not hold position perfectly in high-vibration setups.
- The lack of specific mounting hardware means you'll need to design and build your own enclosure or bracket.
Full Specifications
| UPC | 887898100469 |
| ASIN | B072JB71G8 |
| Brand | lights88 |
| Color | Brass, Black |
| Style | Laser |
| Material | Brass |
| Item Weight | 0.774 ounces |
| Manufacturer | lights88 |
| Operation Mode | Automatic |
| Item model number | 43237-2 |
| Product Dimensions | 1.77"L x 0.57"W |
What Buyers Say
Specific user feedback for this exact ASIN is scarce in public forums and review sites. Based on the product's 3.8/5 rating from 126 reviews on Amazon, it appears to be a functional, albeit basic, laser module. The primary takeaway is its low power output and the need for manual focus adjustment, which are common characteristics of budget-friendly laser diodes in the maker space. The lack of detailed complaints suggests it generally meets the low expectations for its price point and specifications, but also that it's not a standout performer.
“Look, it's a cheap little laser, it makes a purple dot, and yeah, you gotta twist it to focus, but what do you expect for under ten bucks? It works for my little robot's eye, so I'm not mad.”
Common Praise
- The 405nm violet-blue color is distinct for signaling.
- The adjustable focus works to create a sharp dot.
- It's compact and easy to integrate into small projects.
- The wide voltage protection (DC3V-5V) is convenient for various power supplies.
- The brass and copper housing feels sturdy for its size.
Common Complaints
- The 5mW power is too weak for many desired applications, like burning or marking.
- The duty cycle of 10 minutes on, 1-2 seconds off, is restrictive for continuous use.
- The focus mechanism can be sensitive and might require frequent readjustment.
- The laser's visibility is poor in brightly lit rooms.
- No clear instructions or wiring diagrams are included with the module.
Ownership Tips
- The focus adjustment can drift slightly if the module experiences vibration.
- It gets warm if run for the full 10-minute duty cycle, so passive cooling might be a good idea.
- The wires are thin and can be fragile, requiring careful handling during soldering.
- The violet light is harder to see than red or green lasers, especially on darker surfaces.
- You'll definitely need a current-limiting resistor if you're not using a regulated 3V supply, even with the wide voltage protection.
Frequently Asked Questions
What color is a 405nm laser?
A 405nm laser emits light in the violet-blue spectrum, often appearing as a deep purple or violet color to the human eye.
Can this laser burn or engrave materials?
No, at only 5mW, this laser is not powerful enough to burn, cut, or engrave most materials. It's primarily for pointing, alignment, or signaling.
How do I adjust the focus?
You adjust the focus by gently rotating the brass cap at the front of the module. This changes the lens position to sharpen the dot at your desired working distance.
What voltage should I use to power this module?
The module is designed to operate optimally at DC 3V, but it has wide voltage protection up to 5V. Using a stable 3V power source is recommended.
Is this laser safe to look at?
No, you should never look directly into any laser beam, regardless of its power. Always use appropriate laser safety glasses when operating this or any laser module.
Buying Guide
When you're looking at laser modules like this, you need to think about what you actually want it to *do*. This isn't a laser pointer for presentations, and it's definitely not for cutting. It's a component for electronics projects. You'll need to power it yourself and integrate it into whatever you're building. Don't expect a plug-and-play experience.
Wavelength (405nm)
This number tells you the color of the laser light. 405nm is in the violet-blue range, which is often used for things like curing resins or detecting fluorescent materials. It's not as bright or visible as a red (650nm) or green (532nm) laser to the human eye.
Power (5mW)
This is how strong the laser is. 5mW is very low power. Think of it like a tiny LED; it's good for a small indicator light or a faint dot for alignment, but it won't burn anything. Higher mW ratings mean more power, but also more safety precautions.
Operating Voltage (DC3V-5V)
This tells you what kind of power supply you need. This module is flexible, running on anything from a couple of AA batteries (3V) up to a standard USB power bank (5V). Just make sure your power source is stable and provides enough current (less than 50mA for this one).
Alternatives
If you need a brighter, more visible dot, look for modules with wavelengths around 532nm (green) or 650nm (red). For any kind of marking or light engraving, you'll need a module with at least 50mW, and likely much higher, along with proper cooling.
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