Dear fellow arduino users,
I made quite a lot of research on the topic of driving high power LED (typically, 1W or 3W RGB led). Their usual characteristics are a voltage dropdown or 3.5V and a typical current of 350mA.
Many people drive them with a simple transistor (or some darlington structure like ULN2003).
But several members of this forum say this is a wrong way of driving them, and a constant current driver is needed.
My questions are :
-Is it wrong to use a transistor or a darlington (like here
)? Are there any risks for the LED? Any heating risk?
-If yes, what is the correct way to drive them? A constant current driver I guess?
Thank you for your answer, I'm quite confused by the differences between all the schematics used to drive high power LED I found on the internet.