EDGE

'I notice that I feel mentally fitter and more clear in my head, so that I can do more work. My colleagues also notice a real difference in the light level with the bluish light. Sparckel's curve ensures that we can continue to work focused for longer at the end of the afternoon.

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It strikes me that my colleagues are also increasingly turning the light on the higher energizing level. When we had to do without Sparckel after the trial period, the light was really missed. Sparckel has helped me, in my recovery period, to be able to tolerate more light with a fitter feeling and that has been beneficial for my recovery.'

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Vivian concludes: 'You are more 'on' with Sparckel and can work faster and more focused. I recently said to a colleague: 'My performance engine runs better with Sparckel.'