Congrats on that! Having up to 4 different persons using it already shows that it's something your customers could have always wanted but it took a little longer for them to get. (They must have anticipated it). With such a great start, it's just a matter of time before you start getting more customers who will prefer paying with Bitcoin. Well done! Wishing you more success to your business and investments.

Congrats!
This sounds good and there are a few small merchants now adopting Bitcoin as a payment and the good thing is they applied Lightning Network that good for microtransaction for example for a small number of products to purchase.  Aside from that, it's totally safe than using a credit card because there's no charge back, make sure at least there's at least 1 confirmation to be done before your customer let leaving at your counter.

I like the idea, it seems you're advertising the forum as well. 
Below on your QR code device reader, there's a line saying, "For more info. visit Bitcointalk.org for more details".

Not new but it's a rather unique kind of store that's accepting bitcoin, most of the time the stores that are accepting bitcoin are food related or general retail related that's making this kind of adoption so it's a new thing for me.

As the saying goes, 'big things started small', so hopefully this will be the case for you.

Accepting Bitcoin will have a lot of pros and cons, but definitely if you are a supporter of it, no matter what comes in the future, you will stick with it. And hopefully if some of your buyers notice he BTC logo, who knows, maybe they will be interested as well, so you are like a bridge and part of the bigger picture in the future.

OP probably has some knowledge or has an employee that helped him with the implementation of LN in his store. I agree that it's a good thing for the community, with a business advertising bitcoin for many to see, I think that you're a big contributing to the increase in adoption rate in bitcoin and crypto as a whole, good job and have a prosperous business OP.

I am curious how you going to "distribute" you Bitcoin income? A lot of merchants make use of Payment processors too, so they convert the Bitcoin back to cash to bypass regulations and laws in their country. (Effectively ...you are accepting Cash and not Bitcoin, when you have transactions processed through Payment processors)

Are you going to keep a portion of the Bitcoin received and hoard it or are you converting all bitcoin received back into fiat? (The merchants that I spoke to, keep about 15% of the profit in Bitcoin to capitalize on the potential that the price might skyrocket in the future and then maximizing their profits) 

Definitely a win for Bitcoin, your business, and your community. Good on you. How about some pictures of signage or whatever it is you use to accept Bitcoin. As they say, a picture is worth a thousand words AMD everybody loves a little Bitcoin porn. Let us know how the popularity goes over time.

Very encouraging to see, and if I can suggest,,, what crypto people did in Singapore which I experienced personally, they tried to get people to use crypto to pay and offered them good discounts or like double stamps in the loyalty card (for example if not discount) if you paid in crypto,,, and that really worked.

Or even like a free small discount for downloading a wallet?

Good luck and enjoy Bitcoin use. Too few people make use important so I am happy to hear.

Congratulations @OP.
This way, you can introduce bitcoin to people around you who go to your store and tell them that you have another option to pay and explain more about bitcoin to them.
You can be a pathfinder to bitcoin to become popular in your city and as the owner of the hardware store, you can tell your competitor that you are making a change to the payment system.
Sooner or later, if many people are aware of that, they will try to use bitcoin to pay and you can become have more customers who will buy many products from your store and your competitor will start to follow you.

Congratulations wnet! Is your hardware's name is also wnet hardware? 
That's a surprise that you didn't just accepted bitcoin/lightning network payment but you did really invested 10 grand on it. What a way to start accepting bitcoin payments. I wish you and your store well at all times. And what's next is probably look at your local neighborhood to look for other crypto folks that's near you.