I went to have a look at it after the electrician had finished because it was completely unfamiliar in design and I wanted to know how to change the bulb.
‘It doesn’t use a bulb,’ said the expert. ‘It has an LCD panel permanently fitted.’
‘So how do I change the panel when the old one blows?’
‘You don’t. You have to have a complete new unit.’
‘Sounds expensive.’
‘It is.’
‘In that case, how long should the LCD panel last?’
‘I believe it’s about 10,000 hours.’ he replied confidently.
Right, so now let’s do the sums:
I estimated that the light in the bathroom is on, year round, for about 20 minutes a day – less in the long days of summer and more in the short, dark days of winter. So 20 mins a day equals an hour every three days. That’s step #1. Now for the calculation.
How many periods of three days are there in a year? Let’s call it 120 for simplicity. So the light is on for 120 hours per year. Is that correct? (I think so. I used to find that kind of thing very easy but my brain is older than it used to be.) Now for the big one. Let’s get the calculator so my brain doesn’t melt.
10,000 ÷ 120 = 83 years.
That seems an awfully long time to me, but if it’s correct I needn’t worry too much because it will see me out by a long way. Then again, the electrician might have been guessing. And if my logic is faulty, please, please, somebody tell me.
But now for the real problem. All the bulbs in my house are Warm White in colour temperature. The one in the new fitting is Daylight and there’s not a damn thing I can do about it. And what it means is this. Since my eyes are accustomed to Warm White, when I go into the bathroom and switch on the light, every white surface – and there are a lot of them – appears pale blue. To an ex-photographer who is very sensitive to colour, that’s irritating.
