Hello, I am trying to source the right bulbs/lamps to undertake some B&W film tests. The colour temperature suggested for these tests is 4800k and the wattage 500. Now in America there are plenty of places who supply blue daylight lamps at the correct wattage and colour, but in the uk (at 240v) I cannot find any. What is my best option? I can find lamps at about 5000k which are high wattage but not blue coated.....do I go for this and find a lighting gel? Is the coating necessary if the colour temperature is correct? Is the extra 200k going to make a vast diffference? Alternatively I can get bulbs at a lower Kelvin 32O0 or at 4800 at a vastly reduced wattage (100w). But this isn't the best option of course.