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Search the Community: Showing results for tags 'dont let the bullshit fool you'.
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Ledgrowlights-Adam posted a topic in Ledgrowlights.co.uk (diyleduk)Id just like to explain a little bit about voltage bins and how temperature effects everything as im smelling way too much bullshit these days. Not every led is the same! Just because it says lm301b, it doesnt mean they are all equal. Each led has a flux and a voltage bin. With the flux bin we want the highest possible, as we get the most Flux per watt then. With the voltage bin, we actually want the lowest as volts x amps = watts and with leds, we want as little wattage as possible, whilst still retaining the high flux out put. So heres a screen shot of the samsung component calculator. This is basically a digital datasheet for manufacturers. We are not using lumens here as a metric, just as a scale to show how the numbers change. As we are working with the same SPD it all scales the same. Both cases we use the lm301b led with the same current and electrical/optical losses/spectrum/cri/temps. Case1 (left column) we use the highest flux bin and the middle voltage bin. This is the most common and if your are lucky you might get this. Case2 (right column) we use the highest flux bin and the lowest voltage bin. This is what HLG uses on their quantum boards and i believe this is very hard to get. As you can see from this table, by using the lower voltage bin we draw less at the wall, in turn, upping the efficiency of the system. Both systems output the same flux, its only the system efficiency that goes down as the voltage is lower. Now onto temps. When we get a system (not a board) sphere tested. A thermocouple will be attached to the light and left to reach temp BEFORE testing. This ensures the correct temp/voltage is reached and gives accurate numbers. As you can see, when a flash test is performed (design 1) the efficiency is much higher, as the temps increase (Design 2-3) the efficiency gos down. Also note the electrical and optical losses that nobody seems to take off there estimates. SYSTEM LEVEL EFFICIENCY means just that. Its at system level, at a temp the system would be running at. Day off, im going to get smashed. Any mistakes let mw know