Enderman
Enlightened
Re: Lumintop GTvn - Best Reflector Thrower?
The CFT90 in the TN42vn90 is only driven at low currents, less than 20A even, and has less heat dissipation.
Here are the calculations for the lux with an Oslon Black Flat: https://www.desmos.com/calculator/dwdwkezaot
It will definitely get above 2Mcd, close to 2.4 at startup and then drop a bit due to heat.
Here is the calculation for a CFT90 running at 30A: https://www.desmos.com/calculator/gaqreazi9c
Almost 2Mcd however you need to take into account that that is 100W of heat, so that 2Mcd will only last a few seconds before it heats up and the output starts dropping.
Here is the calculation for the stock XHP35HI: https://www.desmos.com/calculator/8gma5tpmdk
1.275 Mcd which is exactly what everyone is measuring with their luxmeters +/- 0.02
The lux numbers vinh is getting are wrong because the beam has not diverged enough at 10m to give a correct reading in the hotspot.
Minimum 20m for an accurate number.
Calculating lux based on other flashlights is not very accurate due to different heat dissipation and different current.iv already proved that is impossible. Even the Oslon would not hit 2 million. The throwing ability is 25% better based off the difference between the Xhp35 led and the CFT90 led in the TN42 host using real numbers. the bigger host will have the same 25% of throw improvement. Based on this guys estimate this led would need to have a 63% increase in throw over the xhp35 and its no where close. Now the led is not driven to its max in the tn42vn90. lets add 1000 more lumens and raise the throw Increase to 35%. So if the CFT90 throws 35% better in the GT over the Xhp35 then we get 1.7 million lux. and that is being generous. Im not trying to get you mad or anything i just dont want you to be dissapointed if its only 1.6m lol. and btw 1.6million and 5000 lumens is quite revolutionary in its own right.
The CFT90 in the TN42vn90 is only driven at low currents, less than 20A even, and has less heat dissipation.
Here are the calculations for the lux with an Oslon Black Flat: https://www.desmos.com/calculator/dwdwkezaot
It will definitely get above 2Mcd, close to 2.4 at startup and then drop a bit due to heat.
Here is the calculation for a CFT90 running at 30A: https://www.desmos.com/calculator/gaqreazi9c
Almost 2Mcd however you need to take into account that that is 100W of heat, so that 2Mcd will only last a few seconds before it heats up and the output starts dropping.
Here is the calculation for the stock XHP35HI: https://www.desmos.com/calculator/8gma5tpmdk
1.275 Mcd which is exactly what everyone is measuring with their luxmeters +/- 0.02
The lux numbers vinh is getting are wrong because the beam has not diverged enough at 10m to give a correct reading in the hotspot.
Minimum 20m for an accurate number.