I will pick up a new bulb before I give it a try again, but I think my LED's will provide more than enough light for a moss wall. The one I bought is a high quality 46" Ecolight with 138 ultra bright wide angle led with 12 ultra bright wide angle blue lunar lights(150 total). It only consumes 14.4 watts with a 6000K color temp. "K" or Kelvin rating of 5,000 to 5,500 is a good estimate to simulate a noon sun in most tropical environments. High quality LED's, not the low quality ones are said to be the new thing in lights with out the high heat output. Check out web.