The image on the right shows one of the medical loupes with LED light. They are very useful for detailed work with precision optical instruments for surgery. The price is also tens of thousands of yen.
I thought I would imitate this. I don't need a loupe, but an LED would help with precision work.
It should be detachable from glasses and lightweight.
Batteries should be separate, of course. Cables may be cumbersome, but lightweight should be a priority in this regard.
The right image shows the attachment part of the sunglasses that can be attached to and detached from the glasses. The lenses of the sunglasses were thrown away. I found such a thing for 100 yen. There is no way not to use it.
Since we are using a PowerLED, we would like to have a constant-current circuit if possible, but it would be too heavy to put on an attachment with a LED. A semiconductor is a very small thing.
PowerLED is sufficient for 100lumen/1W, so I decided to drive it with a single resistor, assuming 5.0V, which is likely to be the standard power supply.
The reflector was added because the light distribution was too wide for the purpose when using only LED. Perhaps a collimator that can narrow down the light distribution would have been better.
Heavy heat sink cannot be used. No matter if it is a lightweight small heat sink, it is too heavy.
A sheet of perforated metal was added to the back side of the clamping bolt to release the heat transmitted from the bolt. It's not much, but it makes a big difference.
I didn't weigh it, but it turned out to be pretty lightweight.
It is an exaggeration to say modularization, but each of these attachments and power supplies can be used as a general-purpose item.
Or, actually, there are several power supplies that can be used universally, so use those.
The two power supplies used in the left image; they are 5 V, so an extra portable AC adapter can be used, but the battery type is more convenient, as the power supply can be placed in a pocket.
The two AA type on the left has a circuit to boost the voltage to 5.0V. It was made as an emergency power supply in the era of mobile phones, and can also output USB.
The four AA type power supply on the right side is a stabilized power supply with variable output voltage. It was made as a power supply for a vaporizer and is also useful as a power supply for experiments in electronic construction.
One might say that if we are talking about modularization, we should use general-purpose USB for connectors, but we have been using JIS-standard plugs as connectors for this type of equipment since before USB became widespread, and we cannot change that now.
The point is to avoid specializing the power supply by adding circuits for LED.