So let's talk about the last question on the custom economics. And the math here is very similar to what I showed you on the little example about energy consumption and the [INAUDIBLE] calculation for the cost. So let's split it very similar to the example back then into the incandescent cost and the cost for the LED. There are two parts of cost we have to consider. One is the power and the other one is for all the bulbs we need for the incandescent to live as long as a single LED bulb. So the power calculation is fairly straightforward. In our case the lamp has 75 watts, the average U.S. retail power weight is, 12.7 cents per kilowatt hour. And we have to divide this by 1,000 and multiply it with 18,000. And the answer here is and I'll admit I looked it up it's $171.45. So to run incandescent lamp with 75 watts for 18,000 hours, which is as long as the LED lasts, it's $171.45. Now, you might also recall, we hinted at an incandescent light bulb is living only 750 hours. So how many incandescent lightbulbs do you have to buy to give the same lifetime as an LED bulb? That's a simple math. It's 18000 divided by 750. And there is 24. So, the bulb cost 40 cents. So, we have 24 times 40 cents. And that was given on the case briefing. And that equates to $9.60. So, now, we add the two up and the total cost, therefore, for the incandescent is $181.05. Now the math for the LED is simpler because we only have to consider the power cost. And here again, given in the case, we said it was nine watts times 12 cents, divided by 1,000, times 18,000. And that is, well, it's a very small number. It's actually only $20.57. So now we basically can compare the two and we subtract it so we have $181, that are the full cost for the incandescent, minus the electricity cost for the LED. And that gives us $160.48. So as long as we price bellow $160 we create customer value. Now obviously $160 is a lot of money and we wouldn't even go that far. In fact, you know that we've talked about prices between $8 and $20. So there is a very strong upside for consumers to install an LED. Now, all the numbers I've used, actually the energy rate I used was for the consumers. For businesses they have, because they buy in bulk, have a lower energy rate by about minus 15%. So. The math is identical, it's just that this here comes down for business customers. This here comes down for business customers by 15%. And when you do that, you still get around a value creation of around $138. So, even there, we still have a lot of head room to price our LED. So, from a customer economic perspective, we have a very strong case to sell lots of them.