csiluk Not at this moment. Currently, the SFT40 is only available in 6500K. However, I do have a few lights using the SFT40 and it is much better than either SST40.

csiluk Look for a light using an SST20 led with a 4000K color temperature. It can a single emitter or multiple emitters.

csiluk These are unprotected button top cells.

csiluk A very high quality, unprotected, flat top or button top, 26650 such as the black Shockli 5500mAh 20A-30A. Using a protected cell may not allow the light to operate at full power. And using "bargain" batteries will do the same. Do your research on batteries because there are a lot of false claims printed on batteries. If your going to buy cheap batteries, don't even bother to purchase the light.

csiluk It stands for "color rendering index". The higher the number, the more accurate the colors appear. The scale goes to 100 and most decent quality lights average between 70-80.

csiluk No. Battery must be purchased separately. You will also need a li-ion charger to charge the battery.

csiluk I measured my 30Q button tops and I got 66.9mm. And this is where I got them from.