230VAC to 230VDC converter for flicker free LED construction lights for use in videography/photography
A POSSIBLE solution that is "easy &amp; cheap enough" to try is to use a light dimmer unit followed by your full bridge rectifier plus filter capacitor. 

Cheap dimmers usually use "phase angle control", so the waveform is truncated to a variable extent at the start of the cycle. This means that the peak voltage is usually about the same and if lightly loaded the DC will be at about the same level as before :-(.
However, as you reduce the dimmer output level you may achieve a result that is satisfactory. There re enough variables there to make it not certain, but it's probably worth trying. 

Some dimmers provide high frequency PWM switching of the input AC waveform and so give a far less distorted output waveform.
They are less common and probably substantially more expensive.

A fairly 'Heath Robinson'*  solution is to place a load of about half the LED light effective resistance in series with the rectifier plus LEDs - either in the AC or DC sides. This could be eg several 100 Watt incandescent light bulbs in parallel or perhaps a domestic toaster element (in or out of toaster :-) ). [Stove element, electric kettle element, ... ].
Some experiment would probably be required but the result could be effective and lowish cost if not very pretty. 

A more certain but more costly method is to use a 'variac' variable output voltage transformer.
These do not distort the waveform. 

It may be (or may not) that use of a 220:110V step down transformer plus bridge rectifier will be adequate. Peak voltage is then Vin x 1/2 x 1.414 ~~~= 160 VDC if well filtered. Whether your LEDs handle that well is tbd. 230:110 or similar transformers are often available at relatively low cost for their power ratings. 

Unlikely but possible: A transfomer with tappings or secondary windings that give you about 230V:160VAC  will give you about 230 VDC when peak rectified.

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*If you don't know about Heath Robinson, it's worth making his acquaintance :-)