The Reylight MK3 10440 in Aluminum is a fantastic and more affordable alternative to the titanium version. You get all the same great optics and electronics in a host with different practical characteristics.

Here’s a detailed breakdown, focusing on what the aluminum construction changes and the core features that remain the same.

Core Features (Shared with Ti Version):
LED: Nichia 519a R9080 4000K - The star of the show. Same beautiful, high-CRI, neutral-warm beam with a clean profile from the TIR optic.

Driver & UI: Identical 4-group UI with mode memory (except moonlight). The selection process is the same:

From OFF, 10 half-presses.

On the next click, cycle through groups.

Click to select, wait to save.

Switch: Reverse clicky (press halfway to change modes after initial turn-on).

Clip & Screws: Still uses the popular Steel Flame compatible pattern and includes titanium anodized screws for a premium touch.

Battery: Includes a 10440 Li-ion and can also run on standard AAA batteries (NiMH/alkaline) for longer runtime at lower output.

Key Differences & Advantages of the Aluminum Version:
Heat Management (The Big One):

Aluminum is an excellent thermal conductor. This means heat is pulled away from the LED more efficiently and spread throughout the body.

Practical Effect: The light will feel hotter to the touch more quickly on 100% mode because the heat is transferred to the shell. However, this is actually better for the LED's longevity, as it prevents heat from being trapped at the emitter.

It will still get very warm, but it's managing heat more effectively than titanium.

Weight:

Aluminum is significantly lighter than titanium. This makes the MK3 even more unnoticeable in the pocket, a true featherweight EDC.

Durability & Feel:

Toughness: Aluminum is durable but can dent or scratch more easily than titanium. Titanium is harder and more scratch-resistant.

Surface Feel: Aluminum often has a slightly chalkier or smoother anodized feel compared to titanium's distinctive "dry" metallic feel. The anodizing on aluminum is very hard and provides good corrosion resistance.

Cost:

This is the primary reason for choosing aluminum. You get the exact same internal performance and beam quality at a lower price point.

Practical Tips for the Aluminum MK3:
Battery Recommendations are Identical: Use a quality unprotected 3.7V 10440 (Vapcell is best) or a standard 1.5V AAA for emergency/long runtime use.

Thermal Behavior is a Feature, Not a Bug: Don't be alarmed when it gets warm. The aluminum is doing its job. It will still step down from maximum output to manage temperature, just like the titanium version.

Anodizing: The colored finish (if you have a version like Pineapple) is anodized, which is quite durable but can show wear over time on sharp edges—this adds character.

Clip Compatibility: All the same aftermarket clips (Steel Flame, LynchNW, etc.) that fit the titanium model will fit this one.

Which One Should You Choose? Summary:
Choose the Aluminum MK3 if: Your priority is value, lighter weight, and slightly better thermal performance for the LED. It's a no-compromise performance-oriented choice.

Choose the Titanium MK3 if: You prioritize premium material feel (heft, uniqueness), superior scratch resistance, and that distinctive "cool" factor of titanium. It's more of a materials-oriented choice.

You have made a great choice. The aluminum MK3 delivers the incredible Nichia 519a 4000K R9080 beam—which is the heart of this light's appeal—in a practical, lightweight, and cost-effective package. It's one of the best compact high-CRI lights you can buy.

Enjoy your new light! It's perfect for everyday tasks where beautiful, accurate light matters

Group1: (Moonlight)-2%-20%-100%  ( Default)

Group2: (ML)-10%-40%-100%

Group3: (ML)-2%-10%-50%

Group4: (ML)-50%-100%-strobe-SOS

SHIPPING
The final shipping cost and estimated delivery timeframe will be available to you during checkout. Currently, we offer 3 International shipping methods which are steady and easy to track. Priority worldwide shipping, Premium ( Partial countries) and a faster Express shipping. The estimated times stated below are not guaranteed. An international package could experience delays like postal strikes or severe weather or Cov-19 situation. All shipping ways, PO Box address is not acceptable.

For some flashlights, there's a pure battery inside（phone charging）,If We can not ship your packages via USPS or DHL,we'll ship your package in another way.

Note:
When you place an order for just the batteries, for easy shipping, faster and safe delivery, the batteries are placed in the flashlights.

If you don’t receive your order within the estimated time frame provided below and suspect that it might be lost in transit, please contact Flashlightgo Support ( support@flashlightgo.com ) and we can look into the order with the courier. Lost-in-transit requests must be submitted to Flashlightgo Support within 3 months of the date of shipping or before the courier archives the tracking information.

Option 1.
Express by DHL/UPS/Fedex/Aramax/SF etc ( there may be tax need to pay in this way),
The estimated time of delivery is usually 3-7 work days depending on the country. Includes detailed tracking and confirmation of delivery.

Option 2.
Premium ( 6-10days, All tax and Duty Paid),
All tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.

Option 3.
Priority shipping(1-2 Weeks, average 10 days)
If we marked it is with all tax and duty paid, all tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.

Learn more,Please click on Here.

To ensure that you get the desirable product, we allow a seven-day product return period. Any product return application outside this period will not be entertained.
All returned product must be unused and the original package should be kept.

Return：
We do not offer return for personal products like socks and hats or food, magazine and fragile or dangerous products The original receipt must be available for application of return.

Discount products：
No product return for discount products

Gifts products：
If the item is marked as a gift when purchased and shipped directly to you, it cannot be exchanged , refunded or warranty.

Exchange：
We only replace items if they are defective or damaged.
Exchange service are offered only to wrong deliveries or product damage not caused by client. If needed, please email to info@flashlightgo.com.

Warranty
How long is the warranty period?
Flashlightgo warrants to the original purchaser that the Product(s) shall be free of any defect in material or workmanship for a period of one year for labor and one year for parts from the date of the original order except the items listed below:
Chargers,Batteries and Other Accessories: 3 months warranty

Should the Product(s) supplied by Flashlightgo prove defective because of improper workmanship or material as reasonably determined by us, Flashlightgo agrees, at its option, to either repair or replace the Product free of charge, excluding any shipping or handling charges.

Learn more,Please click here.