Thanks everyone
OK looks like we are there, even though LED resistor calculators say 68R gives 52ma, in the real world 39R acutally gives 54ma, I don't want to know why![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
So running it at 54ma for short periods (50ms) with a 39R should be OK unless anyone is going to say different?
Thanks again for all your help and I love electronics even though when I think I understand something, I find I don't!
OK looks like we are there, even though LED resistor calculators say 68R gives 52ma, in the real world 39R acutally gives 54ma, I don't want to know why
So running it at 54ma for short periods (50ms) with a 39R should be OK unless anyone is going to say different?
Thanks again for all your help and I love electronics even though when I think I understand something, I find I don't!