Check out Omega Speaker Systems. Most of their speakers are single-drivers designed with low wattage amps in mind(93-96dB/8ohms) and they have several monitor models. All now use their hemp cone speakers
Here's a Positive Feedback review
As to whether they sound like the 47 Lab Lens, I haven't the faintest idea.
Here's a Positive Feedback review
As to whether they sound like the 47 Lab Lens, I haven't the faintest idea.