Here's what I found - LUMENS/WATT CALCULATOR , hope it 'll help. Every room has its own lighting requirements and, for example, the bedroom is quite special in this regard as well: your lighting has to be subtle, yet strong, and it needs to help you relax instead of making you feel like you’re under a spotlight. Installing lights is, therefore, a job for a professional and there are lots of lighting experts out there who can recommend the best option for your particular bedroom. A number of people from Australia, for instance, are contacting a reliable electrician from Sydney who inspects their homes and suggests the ideal lighting setup.