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Description
ri-focus® LED Headlamp with NiMH batteries and battery chargerProduct overview Powerful LED headlamp Continuously focusable Balanced, adjustable headband Integrated pads removable and washable Optionally with battery or rechargeable battery ri focus LED Headlamp The ri focus LED headlamp from Riester provides ideal illumination of the examination field from a distance of 40cm. The LED headlamp has an easy to clean headband equipped with removable and washable pads that ensure a high level of wearing comfort.
Product overview- Powerful LED headlamp
- Continuously focusable
- Balanced, adjustable headband
- Integrated pads removable and washable
- Optionally with battery or rechargeable battery
ri-focus® LED Headlamp
The ri-focus® LED headlamp from Riester provides ideal illumination of the examination field from a distance of 40cm. The LED headlamp has an easy-to-clean headband equipped with removable and washable pads that ensure a high level of wearing comfort. With a service life of up to 50,000 hours, the LED lamp installed in the ri-focus is particularly economical.
The ri-focus LED headlamp is optionally available with lithium batteries or with NiMH rechargeable batteries and 230 V plug-in charger. Due to the battery or rechargeable battery operation, there is no disturbing power cable in the way during the examination and the ri-focus LED headlamp is suitable for mobile use.
Product Details
- ri-focus® LED headlamp from Riester
- LED headlamp with integrated battery compartment and integrated charging socket
- White LED with 6000 Kelvin
- Continually adjustable focus of approx. Ø 40 mm - Ø 200 mm (at 40 cm working distance)
- Efficient Diagnosis Thanks to High Power LED with 140 Lumen
- LED service life up to 50,000 hours
- Low heat generation and low energy loss
- One-handed operation
- Comfortable, balanced and continuously adjustable headband
- Inner padding is removable and washable
- On/off switch located on the battery compartment
- Battery compartment on the back of the headband
- Operates with non-rechargeable lithium batteries or NiMH rechargeable batteries
- Weight without batteries approx. 210g
- Battery operation approx. 4 hours with lithium batteries.
- Battery operation approx. 90 minutes rechargeable batteries from a full charge
Technical Details
| Distance | 400 mm | 200 mm |
| Lux max. | 10,000 | 23,000 |
| Light circle max. Ø; | 200 mm | 120 mm |
| Light circle min. Ø | 40 mm | 30 mm |
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4.7 ★★★★★
Based on 29 reviews
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Product Reviews
★★★★★ 1
Light on substance and heavy on flaws
Format: Paperback
The book has a great list of topics, but fails to provide much substance any of them.
Most of the provided code is just comments that avoid the actual crux of the issues being discussed. (e.g. #implement the logic to validate XYZ - while the whole point of this chapter is teach how the heck we validate XYZ!)
Some parts are plain wrong, for example the part on Graph based RAG is fundamentally flawed as it assumes the text embedding and the graph embedding are in the same latent space. (This is one of many more examples).
Seems like the book was rushed, and the author has limited hands on experience (if any).
At least we know based on the amount of flaws that it was not written by an LLM
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Reviewed in the United States on December 31, 2025
★★★★★ 5
Excellent book to truly understand LLM design patterns
Format: Paperback
I just finished reviewing Ken Huang's pocket book on LLM Design Patterns, and WOW what an amazing resource! This book is excellent if you want to truly understand how to create and enhance intelligent AI language models, all that in your pocket!
Ken makes the difficult things seem surprisingly easy, and that's the real MAGIC.
- How to prepare your data for training by making it extremely clean.
Developing the brains: the practical aspects of training, optimizing, and maintaining your models.
- Learn amazing prompting techniques (such as Chain-of-Thought and Tree-of-Thoughts) to improve your AI's reasoning and problem-solving abilities.
Learn everything there is to know about RAGs so that your LLM can incorporate outside expertise.
- It also delves into creating "agentic" AI that is capable of action and planning (not only simple plan and execute but also enhanced techniques like ReWoo!)
Really, this feels like a useful toolkit, so Ken thank you for that resource
Thanks, Idan Habler
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Reviewed in the United States on June 9, 2025
★★★★★ 3
A Broad Overview, But Light on Modern Fine-Tuning
Format: Paperback
I'm currently really interested in fine-tuning LLMs and recently completed my first LoRA-based fine-tuning on a quantized model. I came to this book looking for more detail on fine-tuning. While it touches on the topic, I found the content didn’t quite align with the current state of the field in 2025. Techniques like LoRA, QLoRA, and PEFT weren’t really covered, and the material leaned more toward what I think are older or lower level approaches. That made it harder to connect with what I’m actually working on.
That said, when I shifted to other chapters — like the sections on prompt engineering techniques such as Chain of Thought (CoT) and Tree of Thought (ToT) — I found more value. These sections were clearer, and I picked up a few practical insights, like using few-shot examples that walk through the CoT reasoning process. That’s not something I’ve tried before, and I can see how it might help smaller models that struggle with any type of reasoning tasks.
Overall, the book feels more like a broad overview of all LLM concepts. For someone exploring many topics across the LLM ecosystem, it offers a wide-ranging introduction. But for readers like me who are actively trying to learn and apply techniques like fine-tuning and quantization, it may leave you wanting up-to-date guidance.
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Reviewed in the United States on August 10, 2025
★★★★★ 5
Great foundation read for security!
Format: Paperback
This book is a great read! It builds a strong foundation and I would highly recommend it for builders who are interetsed in building on LLMs and ensuring everything is secure. Security is super important and this book does it justice!
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Reviewed in the United States on June 27, 2025
★★★★★ 5
Loved it
Format: Paperback
I’ve easily read dozens of tech books. I liked this one a lot. Sure, there were boring parts, but most of it was engaging, especially on dry subjects. I previously read “How AI Works” and found this more informative and way more enjoyable. I got through the 700 pages in about 5 weeks while also learning about probability and linear algebra from other books and online sources. I’d love to read something more advanced by the author, maybe getting into more modern applications. I feel more comfortable with the subject and feel I am now ready to conquer more advanced texts. I initially picked this up to give me some background before reading “How to Build a LLM (from scratch)”. I’ve ordered an intermediary Deep Learning with Python book as well, but wouldn’t mind a more advanced theory book to accompany these books. I’ll definitely be rereading sections of this book to further familiarize myself with topics like backpropagation. Highly recommend if you’re looking for a gentle, but broad introduction to the topic.
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Reviewed in the United States on November 14, 2025
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