Chapter 48: The Optimal Brightness for Concentration: 400-500 Lux (2)
“Excuse me, but what’s 400…… Lux? And Kelvin……?”
“Ah, um. I see. First of all, what is Lux……?”
Kyung-joon explained about Lux, the unit for measuring illuminance.
Unfortunately, Froi’s reaction was one of despair.
“I…… I understand that ‘1 candela’ is the brightness of the light emitted by one candle, but after that, what are you talking about……?”
Froi understood only 5% of what Kyung-joon was saying.
Despite this, Kyung-joon didn’t frown and ask why he didn’t understand.
“It’s okay. Let me explain it more easily with a drawing.”
“Yes? Ah, um…… Alright.”
Kyung-joon took out paper and a pencil from his inventory and kindly resumed his explanation.
Froi had no choice but to focus on the sudden explanation once again.
‘What is going on?’
Froi was greatly embarrassed by the situation he was in, suddenly receiving a lesson.
But Kyung-joon’s explanation had already begun.
Seeing Kyung-joon explaining with such sparkling eyes, Froi couldn’t bring himself to say he wouldn’t listen.
Besides, Kyung-joon was a premium customer who paid 1 million Liyan.
It was the principle of the employees here to listen to as much as possible to find the items that premium customers wanted.
But a surprising thing happened after about 5 minutes.
“Aha! So, 1 candela represents the nature of light itself, like a candle or a bonfire, and depending on which direction you look at it from here…… (omitted)…… Is that right?!”
“Yes, you can understand it that way.”
“I think I understand it to some extent!”
Surprisingly, Froi understood Kyung-joon’s explanation.
Not 100%, but he got the gist of it.
It was all thanks to Kyung-joon’s excellent explanation.
Kyung-joon then gave him a quiz.
“Then, how many Lux would a candle be at a distance of about 1m?”
“Ah, um. That is……”
Froi rested his chin on his hand and pondered.
However, when he couldn’t answer for over a minute, Kyung-joon was about to tell him the answer himself.
“W, Wait a minute! I think I know! Hmm, hmm……! Hmm!”
Froi refused to let Kyung-joon answer!
He looked like a student who had just figured out a riddle and was begging the teacher to let him answer.
“Haha, alright. I’ll give you one more minute.”
Kyung-joon smiled slightly and expressed satisfaction with the game he had started for fun.
In fact, he had one purpose for doing this.
‘To know if you really know something, you should be able to explain it to an elementary school student.’
Kyung-joon explained it to Froi to see if he had really studied properly.
Of course, Froi wasn’t an elementary school student.
However, he was an NPC, a resident of the world who knew nothing about science.
The fact that he was so engrossed in the problem Kyung-joon had given him was proof that Kyung-joon’s explanation was incredibly easy to understand.
‘I guess I did study properly.’
Kyung-joon was pleased with his growth and waited for a minute.
Then Froi finally opened his mouth, making a fuss as if he had figured it out.
“I know! It’s 1 Lux, 1 Lux! Whether it’s candela, lumen, or whatever, it’s just a matter of how you say it, it’s like a play on words, so 1m is 1 Lux!”
“That’s right. Units are nothing more than an agreement on how to call them. If you know the agreement, the rest is just a play on words.”
The reason why 1 “Daseul” is 12 and 1 “Geun” is 600g.
It’s just how it was agreed upon.
Unit conversion was nothing more than juggling numbers according to the agreement.
Anyway……
“Then can I tell you again? The shard I’m looking for is……”
Kyung-joon repeated his initial request to Froi.
The words were the same, but the reaction was worlds apart.
Froi, who had wondered what alien language it was when he first heard it, was now nodding his head.
“I understand. I’ll bring you some items as you requested.”
Froi was able to understand Kyung-joon’s scientific explanation and act accordingly.
After just 5 minutes of explanation.
🔷🔷🔷🔷🔷🔷
“I’ve brought various items as you requested.”
The box Froi brought contained various grades of shards.
There were two types: fire shards and light shards.
There were several of each, from the lowest to the middle grade.
Kyung-joon looked at them and thought.
‘The higher the grade, the brighter it is. The light shard is white, and the fire shard is red. Huh?’
Kyung-joon looked at the middle-grade fire shard a little more closely.
There was an orange color in the middle of the red body.
“Can I put some mana into this for a moment?”
“Mana, sir?”
“Yes. There’s something I want to check.”
The reason Kyung-joon was buying shards was to use them as a light source for his stand.
A stand that maintains the optimal brightness of 400-500 Lux for concentration and can freely change color according to the subject being studied.
To do this, Kyung-joon needed to take a closer look at the shard.
“Hmm……”
Froi pondered for a moment.
He was worried that the product might get damaged.
He thought……
‘There must be a reason. It’s also rude to ask a premium customer about these things.’
“If it’s just for inspection, then alright. However, please be aware that if the product is altered or damaged, the purchase will be confirmed.”
“Alright. Then……”
Immediately, Kyung-joon grabbed the middle-grade fire shard and poured in a faint amount of mana.
At the same time, he held the lowest-grade fire shard in his other hand and did the same.
Wooooong!
[ Rare Skill 『Fine Mana Manipulation (Lv.5)』 ]
[ Rare Skill 『Multi-Casting (Lv.2)』 ]
He began to insert mana between the very complex shard particles using Fine Mana Manipulation.
He did this simultaneously with both the middle-grade and lowest-grade fire shards in each hand.
The mana in Kyung-joon’s hands began to move dazzlingly.
Froi’s eyes widened like saucers as he watched.
‘The mana movements in both hands are different? And yet, those delicate movements……?!’
As a premium customer service representative of the World’s Best level, he had basic knowledge in various fields such as magic, alchemy, and blacksmithing.
Therefore, he could immediately tell how absurd a feat Kyung-joon was currently performing.
‘……That’s beyond the realm of ordinary Multi-Casting.’
To compare Kyung-joon’s actions, it was like drawing a square with his left hand and a triangle with his right hand at the same time.
No, it was more than that.
It was like writing Chinese characters with his left hand and English with his right hand.
‘Even ordinary Multi-Casting can’t be learned until after the 2nd Promotion, he’s truly amazing…’
Just as Froi was about to get used to what was happening in front of him…
“Gasp!”
Something even stranger happened.
‘The color of the shard is changing?!’
Woooong!
The color of the fire shard in Kyung-joon’s hand was changing!
The dark red of the lowest-grade fire shard gradually turned to a pale red, then to a deep orange.
The middle of the middle-grade fire shard gradually turned yellow, then spread throughout the entire shard, turning it all yellow.
Seeing this, Kyung-joon thought.
‘Hmm. The color of the fire shard changes as you put in mana. I guess the color temperature changes depending on the mana.’
For reference, here’s what color temperature is:
Red: 1,000~2,000 Kelvin
Orange: 2,000~3,000 Kelvin
Yellow: 3,000~5,000 Kelvin
White: 5,000~6,000 Kelvin
Blue: 6,000 Kelvin or higher
‘I wonder how high it will go.’
Kyung-joon continued to pour in mana.
Brrr!
At some point, mana began to leak back out of the shard.
The shards in both hands trembled.
It seemed that they couldn’t accept any more mana.
If he forced it any further, the poor shards might break.
At that moment, Teemo spoke.
<The lowest-grade fire shard has been measured up to 2,879 Kelvin, and the middle-grade fire shard up to 8,654 Kelvin.>
“Good. 2,879 Kelvin and 8,654 Kelvin, huh.”
Kyung-joon wrote down the measurement results on the paper.
Then he picked up a different shard than before.
This time, it wasn’t a fire shard, but a light shard.
Wooong!
Kyung-joon repeated the same process as before.
Unlike the fire shard, whose color changed when mana was poured in, the light shard remained a constant white.
Instead, the brightness changed.
“As expected. Just as I thought.”
With this, he could create a stand that could freely change both brightness and color.
“Good, let’s go with the low-grade fire shard this time. Teemo, get ready to measure.”
<Understood.>
And so, Kyung-joon continued to pick up various shards and repeat the measurements.
🔷🔷🔷🔷🔷🔷
[ Rare Skill 『Multi-Casting (Lv.2)』 has leveled up to 3.]
After finishing all the measurements, Kyung-joon’s skill level also increased by one.
Kyung-joon said to Froi.
“You picked them out well, just as you said. I think I’ll buy all of them except for this one and this one. And I think I’ll buy a lot of this one and this one.”
“…….”
But there was no reply.
“Hello? Mr. Froi?”
“Ah……! S, Sorry! I spaced out for a moment.”
Froi had been lost in thought, watching Kyung-joon handle mana.
The way he freely controlled mana, changing the color and brightness of the shards, was like a legendary alchemist he had only heard of in his younger days.
“Anyway, I think I’ll buy all of them except for this one and this one.”
“Ah, is that so? I understand. Then, let’s fill out the order form……”
“Before that, can I buy these two first?”
Kyung-joon picked up the lowest-grade light shard and the lowest-grade fire shard and showed them to Froi.
“Just these two, sir?”
“Yes. I’ll process them a bit and then decide on the rest. That way, I’ll have an accurate estimate of how many to buy.”
Froi nodded at Kyung-joon’s words.
“Yes, I understand. Then, I’ll prepare the order form for just these two.”
Other crafters often made similar requests.
Froi filled out two lines on the order form with a familiar gesture and asked again.
“Then, shall we proceed with the rest of the transaction tomorrow?”
“No? I’m going to do it today.”
“Pardon?”
Both Froi and Kyung-joon tilted their heads.
They seemed to be talking past each other.
“Didn’t you say you were going to process the materials? And then decide on the rest of the purchase after making an estimate?”
“Yes, that’s right.”
“Then, wouldn’t it be better to make the transaction again tomorrow after you’ve finished working on them in your workshop? You can do it in the evening, but if it gets too late, I’ll have to leave work.”
“It’s okay. I’ll finish it here quickly.”
“Here, sir?”
Froi was momentarily taken aback.
‘He’s going to process the shards right here? Without any tools?’
Impossible.
Shards were not easy to process.
They required various magical processes, which in turn necessitated the use of various tools.
‘Ah, perhaps portable tools?’
But even then, to work in this small consultation room……
“Kyung-joon-nim, even if you have portable tools, they must be quite large. Wouldn’t it be difficult in this small consultation room?”
Froi politely expressed his disapproval.
However, Kyung-joon’s will was firm.
“You don’t have to worry about that. I’m going to do it by hand without any tools.”
“Excuse me?”
Froi made a face even more surprised than before.
Process the shard with bare hands?
Without any tools?
It was complete nonsense.
“Ahem, Kyung-joon-nim. Even if I’m just a consultant, I know it’s impossible……”
Froi coughed and tried to impart his knowledge.
Even if it was a joke, this was looking down on him too much.
Before that, Kyung-joon’s hand moved first.
[Unique skill 『Ultrasonic Vibration Mana Dagger (Lv.1)』 ]
A mana dagger vibrating at a terrifying speed was created in Kyung-joon’s hand.
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