Redness and Burning Normal 24hours After IPL?

There are several reasons for different results.  You cannot compare joules on different machines.  There may also have been a difference in pulse duration, delay and whether a single, double or triple pulse was used or overlapping of pulses.  Different technicians have different methods of treating.  The redness and burning will probably subside soon and would be helped by cold compresses.  Treating with IPL takes experience and should be supervised by a physician, especially if you have any problems.  If you still have concerns, return to the spa for their advice.   

You state that you had a treatment  with a new IPL machine that can go only up to 19 Joules and you have redness and burning 24 hours after, while  previously you had up to 23 joules with apparently no redness or burning.

Also, you state that no different creams were used this time, compared to previous times.

There are several possible explanations:

1-Your skin may have been more tanned prior to treamtent with the new machine.

2-You may also be using a triple combinaton bleaching cream (Triluma) which contains Tretinoin, Hydroquinone and Fluocinolone. The Tretinoin may make your skin more vulnerable to the  IPL  effects of burning and redness and even if you had used  it prior to the previous IPL treatments, thepeeling effects of Tretinoin may vary from one treatment to the next..  It is best to avoid Tretinoin for at least 1 week before IPL and especially before a chemical peel.

3.- Each IPL machine brand has its own calibration factors and 19Joules on one machine might be stronger than 23 Joules on another , although such a big difference  seems unlikely.  When was the new machne last calibrated?

4- Did you have the same number of passes and the same type of pulses (long or short) with both brands of IPL machines? Pl. check with both operators on these specifics.

The redness should disappear in 1 or 2 days, if it hasn't disappeared allready.