How to choose a current source for LEDs?

Question

Do it yourself

Good afternoon!
There are two 6-watt LEDs with the following current-voltage characteristic:

I want to make a lamp out of them so that they work in 200mA mode. Please check my reasoning.
With this current strength, the voltage drop across each diode will be about 36V. So, I need a current source (LED driver), which has 200mA in its characteristics and a voltage plug into which 2 * 36 = 72 falls. However, it was not possible to find such drivers directly, namely, at this current strength, they give too few volts. From this, I conclude that you need to take a more powerful source, and connect a resistor in parallel to limit the current strength to the desired one in the LED branch, and at the same time the voltage will be enough. Am I speaking correctly? I'm thinking of getting this source:
ledstore.ru/blok-pitaniya-arj-le114350-40w,-350ma,-pfc- it's a
pity of course that half of the energy will go into the resistor, but what to do.
And another question about safety: as I understand it, over time, diodes can degrade and their resistance will decrease => a large current will flow through them => the load on the source will increase greatly and it’s not clear what will happen. How to protect yourself from fire?

Answer 1

You argue correctly, only in my opinion you do not take into account the economic component in the calculations. The driver (current stabilizer) in the circuit is the most complex and expensive part, and LEDs, excluding elite manufacturers like Cree, are a penny consumable. Collective farming a driver that is not suitable for diodes simply because you already have diodes is a bad idea. One balancing resistor capable of dissipating 12W will cost no less than diodes, and it will still need to be removed from it by a radiator, it will heat up more than diodes, and it will be a source of fire hazard. When the diodes degrade, either the driver protection is triggered, or the diode burns out with a slight pop and the circuit opens, no catastrophes seemed to be noticed.

Answer 2

Please tell me if something will happen if you turn on the _current_source_ without any load at all? I kind of read somewhere that in this case he might get sick. Because load resistance = infinity and it will increase the voltage indefinitely