Just bought a so called 5000MW 650nm burning laser from Widelasers.com. Measured the output power with a photodiode. The output is less than 20mW. What a ripoff. It costs me $80. It should worth less than $30. With 20mW it's not going to burn anything, even focused, except your wallet. Their advertising bears no relation with the reality, not a bit. I should know better.