If you can’t reach 1800 lumens on your #MH12GTS, it means your battery needs to be recharged. It’s smart enough to cycle through the lower lumens to avoid the highest setting. Also if you’re using a battery that doesn’t have 8A output, like the one included, you won’t be able to reach 1800 lumens as well. Yes it’s kinda intelligent like that. Order yours here while stock last ⏩