I'm using cheap chinese LED (Roleadro 300W) and it was ok for a period time.
When I turn it up, it blinked for about several minutes then it went stable.

But now, it is only blinking like crazy.

So I bought multimeter and check if driver was the problem.

On the LED driver it is written 45- 75v, 650mA.

When I checked with multimeter, It showed me 55 - 74 V and current fluctuating between 0 - 530mA

Is this driver broken?? or is this normal?? or did I measured it wrong?

I measured it like this

Measuring current

　　　┌ multi meter ─┐
Driver ┤　　　　　　　├ led
　　　└─────────┘

Measuring voltage

　　　　　multi meter
Driver ──────┴─────led

If it is broken, Can I replace it with CC driver with 500mA and voltage range between 55 - 75 V??
Or is it just not worth the risk and buy a new one??